Since this thread got bumped I'll post my impressions I posted in the Vita thread yesterday in this thread for the curious:
So, I broke down and bought the collection because I like Jak 1 and 3 quite a bit and after watching some videos online I thought it seemed like the complaints were a bit overblown. Well...
Jak 1 actually runs fine. The first area is quite framey, which is unfortunate. However once you move past the first hub area/levels, it runs totally fine. Good even. So yeah, the first two hours or so are sketchy but after that it's totally fine. Not perfect, but fine. I beat the game and was happy with it.
Jak II is...Jak II. It's not that good of a game. There's a good game at it's core but it's buried under too much bullshit. Having to redo a 10-15 minute mission in its entirety because my finger hit the backtouch and put me into first person at the wrong time is not fun, nor is it fun when you die because a sudden sharp framerate drop screwed you up on a jump. Speaking of, the framerate is bad in general. In small indoor areas it's fine, but out in the city or in a big open area it can get pretty bad. It's quite bad in races too. It's not the worst framerate ever or anything, but it's bad. Oh, and the back touch controls suck. They're unresponsive and the two inputs on each side seem to overlap a bit, so sometimes I hit the back touch intending to do one thing and I do both things at once. Bad port. Stopped playing it about 3 and half hours in.
Jak 3...oh Jak 3. The framerate fluctuates between awful and absolutely-fucking-awful. It's unacceptable that it's this bad. It probably 15-20 FPS most of the time, sometimes worse. Any mission where you have to ride an animal is absolutely terrible because of this and controls like shit. One mission makes you corral a bunch of these animals and I only beat it by sheer attrition, it was completely broken due to framerate. I've also had Jak 3 freeze twice in my 3 hours of playing before I stopped. Awful.
Bottom line: If Jak 1 goes on sale separately in NA like it is in EU it's a pretty safe buy by itself. Go ahead and grab it, it's a good game and an ok port. However do not buy the collection or Jak II or Jak 3. Jak 3 is bad to the point where people should be getting refunds for it, I've never seen a retail product be released with this poor of a framerate.