Realistic = brown, grey, greyish-brown, etc.
It's starting to get a bit better, but I'm sick of the grey-brown, low contrast soup that has become "realistic" in recent times.
Repetitive enemy chatter
It's futile to try and count the number of times I've heard "I see you, bro!" in DE: HR, "Cuidado!" in Rainbow Six, the same five Grunt lines that they've been using ever since Halo 1, "You n'wah!" in Morrowind, etc. etc.
When you have millions on millions of dollars to create a new standard in graphics and hire the best talent in the industry, you can afford to have some guys around the office record a few hours of miscellaneous lines.
Takes forever to get playing
John Carmack talked about this in an interview once. When you boot up DOOM, you press six buttons tops and you're playing in less than ten seconds. DOOM was intentionally made that way because Carmack used to know that gamers wanted to play the game, not watch an infomercial about which companies made the game, what proprietary software is used, who owns the copyrights, what brand of graphics card the game is optimized for, who owns those copyrights, how to train your dragon, and ten stainless steel kitchen knives for three easy payments of $19.95.