I hate the colour brown in video games (They are supposed to be something I goof off with, so I appreciate interesting, eye catching stuff), and anything that takes itself way too seriously. If the game breaks the fourth wall, that's a big bonus.
Also, I appreciate somewhat decent AI, mostly since I typically play single-player. An AI that relies purely on strength of numbers or arms isn't interesting to fight against - I'd rather have a foe that allows me to experience several different tactics, without any particular branch being "gimped".
I'm looking forward to Just Cause 2 because the game seems to not take itself seriously at all, and it seems to have a variety of gameplay options, including explosions
I've been watching a Mercenaries 2 LP, and really that's a pretty ideal game for what I'm looking for, except for the massive bugs that it has... I mean literally, can you hate a game when it has a line that pretty much goes as follows - "Oh god! I'm dying here!... no blood though... stupid T rating!"
In contrast, Oblivion, in which your playstyle tends to be severely limited unless you like being overleveled and under-equipped, resulting in massacre at the hands of arbitrary bandits. It also takes itself really seriously, to the point of tediousness, and has... AI issues. Geometry issues, for one, along with really broken guard/quest interactions. (I was ambushed by a guy I sent to prison, and then had to kill him in self defence. I was labelled a murderer. So I reloaded, and instead got a guard to be my friend, let the guard kill him, still had the guard attack me, even when I hadn't even tapped the attack button, and then had to convince the guard to stop attacking me, even though I wasn't a criminal...)