Fallout 3. I rented the game and I did enjoy it a bit at the start, but I don't really enjoy exploring uhh..."blown up crap." I mean, the combat was fun, but after going into some museum and breaking all my limbs, with no ammo, I couldn't stand it. I might try it again, since people keep saying it's the best game ever created, so I might get into it later.
Another is Far Cry 2. I was really surprised with the awesomeness of the map system and how you can go into a mission however you liked. But what did annoying me was the random sickness. I didn't play too much, but it didn't seem to tie into the story at all, it was just an annoying warning saying, "If you've got some pills, press X!" Not sure if it's a very good analogy, but it reminds me of those signs in the pictures, "Warning:This sign's edges are sharp!"
I also was annoyed with the constant jamming. Ya, I guess it gives you a reason to actually buy guns, but then it makes it impossible to fight with a gun you picked up. And how come the enemies never jammed? Of course, after jamming a bit my gun exploded. Again, might give it a try later, but I was a bit annoyed with it.