Aside from the obvious (and stupid) it's beta, what don't you like? Or specifically dislike? Or expected to be different in a way that you felt would have been better?
1) Movement. Movement felt slow, even with a hunter with a something like 50% agility, both normal and sprinting felt slow. Also you couldn't turn while sprinting without it deactivating sprint. Very annoying. Also, every class gets a "jump modifier". Glide, double jump... they all seem to do the same exact thing, just in different ways. That's lame.
2) Speaking of "they all seem to do the same thing", each sub class each has a movement ability, a melee attack modifier, and abilities that reduce cool downs when you kill with a grenade or kill with the special melee or some such. And on top of it it looks as if you get everything from a subclass, like you're not forced to choose "this or that" abilities/skills you want such as in Borderlands/Borderlands 2, and also each skill levels up in order? All of my characters gained their skills in the same order, one after another.
With just 3 classes, and the similarities of their 3 respective subclasses, It's seems like it's going to feel stale, I hope I'm wrong.
3) Attack AND Impact. I get it, it runs on a curve for enemy scaling. This is so you can't get higher level gear and just steam role earlier level content, which I like, to a degree. A level 20 attack weapon with otherwise equal stats compared to a level 5 attack weapon should only have a slight edge against level 2 content, but a level 200 attack weapon SHOULD allow a player to steam roll level 2 content, not just give a slight edge.
4) Controller layout. Why the F*** in 2014 do we still have games that force pre-set controller layouts? This isn't even on the level of Bush League. Let me fully customize what button does what.
5) Back on abilities/skills, but this time for weapons. Every weapon/armor seems to have linear progression just like the subclasses. I hope this is just something for now, or something just for green/low level items, but this is a stale mechanic. Skill trees for the weapons/armor, where you have a finite number of choices would be great IMO.
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My biggest grip right now would be the Hunter super ability to me (in PvP) is way over powered. Say my Titan uses is super, he did, its finished, move on. But with the Hunters its 3 instant kills or hey if the guy you were going after dies you still have time to move about and get your 3 instant kills. It may not be the long but I feel the supers should all have different ready times depending on how powerful I guess they are. And yes I get that there a "super attack".