Did you guys get X-COM: X-TRA Shitty Edition or something? I've only had a couple bugs, nothing gamebreaking, and the UI's pretty easy. Then again I'm using a gamepad.
There are bugs, although I don't think there are only one or two game-breakers. I'm really looking forward to what the first solid patch will bring (in addition to the one already out). Bugs that I'm aware of:
Game breaker:
Using two aircraft causes focus to stick on the globe, or something (haven't experienced it)
Just had an odd one. Soldier got a promotion, end mission screen did not list him. Went to barracks, no promotion icon. Exit barracks, get told "promotions available". Still not there. Had to reload that mission from an earlier auto-save.
Forever Wounded - A wounded soldier will go to the infirmary and just show "Wounded". No time, and will stay in there until the end of the game. (No, you can't deconstruct his bed, either.
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Minor:
UI overlay glitches - Esc menu not coming up, requiring alt-F4 & reload. Various menu overlays being stuck "on top" even after you close them, requires reload. Soldier armor deco resetting when you equip armor (I think; might be other times also).
Free aiming of grenades/rockets is excessively twitchy after the patch. Might be able to adjust mouse settings, just haven't bothered trying anything. Worked a lot better before the 11 Oct patch.
Various height oddities - targeting where you want to move (ON the ledge, not down in front of it!), for running, grapples, etc.
Cover bug, as in that recently linked video - soldier right next to the alien, and the alien still gets the High Cover from beside him, not between him & soldier.
Stuck "Alien Activity" - had that a couple of times, where it seemed like the game froze. It was several minutes before I closed the game.
Close Combat Specialist (free shot on aliens closing within 4) will not work on a Muton Berserker moving on its free reaction move on your turn.
Aliens teleporting into you - someone on the 2K forums thinks they got unstuck on the map, and simple appear in sight of your last moved soldier.
Stupid pathing (not sure if it's a bug, or feature) - instead of running behind cover to the destination, units take the shortest path, straight through reaction fire. Wish you could put down movement waypoints.
I also think there are some mistakes on the difficulty level tweaks. For example, the UFOpedia shows Base Funding of $100 on Classic, but I started with $75 (+$100 from Germany); although I'm not sure where they got that info. I wonder if there are other difficulty level settings that are off; Classic seems like a pretty big spike from Normal, but that could just be my impression.