So, a few things.
I like the game. However getting close to 32 I see a few issues I have with the game I'd like to outline and explain.
Things I disliked:
1. NPC/PC collision.
-->All too many times and all too easy is it to be caught on each other, or on the boss' legs and so forth. You wanted to use a skill, but some jerkoff ended up running in the way at the last second. Maybe you're trying to get away from a boss, but you're caught between another player and the boss' legs and you literally can't move out of the way of a swipe. This doesn't add to any sort of difficulty, nor does taking it away make the game easier. It simply makes it less frustrating, and allows the combat to remain in its current fluid state.
-->The current state allows people to grief, you can quite literally make a horse wall in front of doors or bridges and people can't get past you. This is kind of unacceptable and again frustrating for obvious reasons. Sure it's funny, but I'd rather do without it.
2. UI disappears on movement
--> Currently, you can't have your ui open and move at the same time. You can move in one direction but that's it, once you change it all disappears. This is kind of frustrating when you're auto running to a destination and trying to do something and the windows disappear. You either have to stop, do whatever you're doing, then move, or keep popping open the windows while readjusting your destination. Really, while moving the windows should just go transparent and stay as they are.
3. UI issues
-->Currently, if you're in a queue for an instance, you get teleported in if you accept the invite. However, if you die or change channels, or pretty much end up getting a load screen or something that messes with the UI, that goes away and doesn't come back. There is no other way to teleport into the instance, so after any of that, you have to hoof it manually into the instance. This should be changed to say, clicking the instance button and "teleporting to instance". This doesn't make the game any easier or harder, just less frustrating.
4. Gems breaking and deaths
-->Gems are basically mini enchantments you put on your gear, and have a chance to break on death. Gems can be but generally are not that cheap, especially if you have a good one. The most frustrating element is when your gems break because of PVP. PVE I could understand, especially since a lot of the gems are PVE based. Your "punishment" for dying is your gems breaking because you aren't being efficient enough in fights. However, gems breaking in pvp is like the phrase "kicking a man while he's down". You're out questing, or trying to get somewhere, and a high level comes around and one shots you. There's no challenge there for him, and just frustration for you. To make matters worse, because you can't res at a nearby quest hub (because that would make too much sense), you have to res at a "town" which 99% of the time is way the fuck off in another zone. Then, to put salt on the wound, you then find out that that dude killing you broke your gems. Awesome. And of course it's not like you can find and kill the asshole because he's a higher level than you. Are you going to beat me while I'm bleeding TERA?
-->An ideal solution to all this is for the game to be like, "oh you died to a player? your gems won't break then". But if you die to a boss or trash, then okay sure.
-->Additionally, make it a little easier to get back where you were when you died. This can be done by some sort of ghost form, and running back to your body, or ressing in the same place after a period of time, or maybe just releasing to a nearby camp/questhub. Make the "easy way out" ressurection warn you that there's a chance of it breaking your gems and giving a debuff or something. Just anything but having to run across an entire zone to get back to where you started or even a whole zone to get to the next one.
5. Other
-->Velika outskirts is empty. There's a manor there, a dock, a bridge.....and nothing else. No mobs, no npcs, nothing. It's barren. Why?
-->What purpose does it serve to not let you mount near the flight master?
-->changing the FOV to something not absurd (like the default of 60 to 90) breaks cutscenes. The camera at lots of times clips through the floor. Not a huge complaint, but it's pretty amusing.
-->Why are the quest rewards so terrible? I once got two questgivers side by side give the same exact quest reward. Then I realized, well obviously it's not for you to use, it's enchanting fodder. Then I realized it was just a huge money sink at anything but max level to keep enchanting your gear past +3, and that none of the bonuses at that level are worth the investment unless you're at max or an artificial max (say like 32 for the Open Beta). That's when I decided I'd rather have more meaningful quest rewards.
-->While I love the combat, I feel there's way too many kill quests and not enough "fun quests". Fun quests is something like, using the bomb to blow stuff up, beating the waves of monsters in a timed match, having to solo a BAM (that doesn't have cheap attacks unlike the naga juggs), maybe get turned into something and have to do something atypical? Anything that is different than the norm is welcome. Maybe a jumping puzzle? Some floor platforms you have to spin? Literally anything.
I'm not going to go into likes, because that would be outlining the entire rest of the game. Those were pretty much the main issues I wanted to bring up.