When first touching the System I was immediately worried about the analog sticks. They seem very touchy, and are aweful close to the buttons, but after some playtime I got used to them suprisingly fast. The placement doesn't really effect anything after you get used to your thumb touching it when you hit the X button and the analog sensitivity worked well for the games I played.
OK so down the list in order of first played.
Touch My Katamari: I love the artstyle of the game so I wanted to see the screen in action for the first time on that. Was not disappointed. The game itself seems like classic Katamari just like all the reviews have been saying. The wackyness is there, the wierd yet cool dialog is there, the extreme japanese origins show everywhere, and the music is peppy and catchy. I hope to get a lot of replay out if it in getting 5 stars everywhere, and it seems if I keep that goal I might be playing for a real long time. I haven't used the touch screen strechy mechanics much, but maybe thats why I'm not getting good rankings.
Biggest complaint is the turn katamari into a star animation is unskipable. Its a really cool animation, but I don't need to see it every single time I retry a stage.
Escape Plan: OK maybe this wasn't the best choice for number two, because I really didn't care for what little I played. It feels extremely gimmicky with way too much trial and error at least at the start. Maybe it'll pick up later, its just not very fun for me. It doesn't help that I'm not a fan of the black and white, moody, slightly depressing artstyle. I made to "make your bed" or something like that and don't know what to do since of the two interactable objects in the room, one (slam through the floor) is instent death, and the other doesn't do anything except blow out seemingly useless steam. I'm ok with figuring things out for yourself, but at least give me some hints as to how your basic mechanics work.
Also precision back touch is a horrible idea. I think some time during the vita's life developers are going to have realize its either a gesture, a drag with onscreen info of where you are on the back, or a 9 quadrant tap. Taping things as if it were a touch screen just doesn't work.
Again, things might pick up after i figure more things out with it, but thats my first impression.
Mutant Blobs Attack: This really helped to bring my spirits back up. Its the standard cheesy scifi type of atmosphere, but for a platformer this is actually suprisingly deep. It's definitly more puzzle/platformer than katamari eat and grow. The eat and grow segments are really segmented and more used to create platforming mandatory collectibles. There are tons of sections with objects you can touch and move using the touch screen and all of them seem really smart and somewhat puzzly, which really justifies the mechanic. There's also a magnetic attract/detract thing going on which they use for some really tricky platforming parts.
Only real complaint is the top down motion control part where you tilt your system to make the blob roll in the direction you tilt. I really don't like games telling me I have to hold my controler or system in a precise way, and the levels with that in it seem really generic and boring anyhow.
Super Stardust Delta: Only really played the arcade mode a little bit, but it seems pretty fun, and is also very pretty. Leaving all the gimicky controls on by default is a mistake, since back touch is too easy to accidently hit for it to be used for one button, and again the tilt stuff which forces you to hold the system in only a single position. Both Super Stardust and Mutent Blob seem to assume you are playing it hunched over looking down at it when I like to play with it either 90 degrees with the ground, or above me while reclining/lieing down.
Anyhow at least with this you can disable all that stuff, and just play with joysticks and buttons and it works fine.
Blazblue Continuum Shift Extend: I'm a super casual fighting game fan that never could get his thumbs to move fast enough to get the desired results, so its just CPU fights for me. That said Blazblue has a very extensive tutorial, a arcade mode, a story mode, a mission mode (separate from the character specific tutorials) and a few other gimicky fight modes, so it seems there is plenty here for me. Only got through half the tutorial mode so far but damn that thing is extensive, and the character that guides you through it is fun enough to keep it interesting. Lots of mechanics to learn.
This is where I realized the D-pad on this is superb. Its basically like an extra clicky nintendo d-pad with diagonal groves carved out to let you know exactly where down and down right is seperated.
It was getting dark by now, and so my first sighting of the black screen blotching. It doesn't seem like a huge deal since it only seems to show up in loading screens. Even in darker games like escape plan I can't really see them in the black areas, only when the whole screen is black.
Wipeout 2048: Saved the best for last. When watching videos of this I'd thought they way they hid draw distances using big buildings and the way the buildings were proportioned were really weird and felt like they were having to compromise to put it on a portable, but after playing it myself, seeing it on the screen its made for I was wrong. It really does look amazing in line with the PS3 Wipeout HD.
By this point I'm actually liking the super touchy, little resistance analog sticks. Makes it really easy to do slight adjustments given the little force you need to put into it. I can see how it might have problems in a shooter like uncharted where you need to have a feel for the center of the stick for those up/down and left/right simultaneous adjustments, but for the games I've been playing these sticks work better.
Closing Thoughts: I still think back touch has potential, but the games I've played have all used it very poorly. I think Virtua Tennis 4 and FIFA do it right from what I've seen, but its the type of thing where when its not used right its used horribly. I hope devlopers can get past that quickly.
Otherwise being able to multitask the music player with everything is great, and the speed between being in game to getting to the music player is crazy fast. I just wish we had internet radio support and podcast support to go with it. I just wish it wasn't so easy to cover up a speaker while holding the thing, making the sound become all muffled.
Overall, I'd say I'm pretty satisfied and can't wait for the firmware updates to make this thing even better.