Disclaimer: I've been playing a lot of different stuff lately because I'm out of work due to a medical problem. I just had surgery and a month of recovery ahead of me, so I have shitloads of free time. I was also on some meds that were making me depressed, so I'm trying to reevaluate some games now that I'm not on the same meds and I can actually find things entertaining again.
Gothic 3 Forsaken Gods Enhanced Edition: I hated it at first, but once I got a feel for it I started to enjoy it. The voice acting, dialogue, and most of the quests are awful, but something about the game makes it just fun to play and explore.
Brink: I played it for about 5 hours and the lag in multiplayer was awful. The single player "campaign" is pretty lame too. I can see the multiplayer being fun if the lag is fixed (it may be by now, haven't played it in a couple of weeks). I'll probably try it again later.
Witcher 2: Started it when I was on a lot of painkillers (which might be why I didn't like Gothic 3 and Brink at first) that were making it really hard to focus and also kind of depressed me. I got a different type and just had surgery yesterday, so I'm in a much better mood now and I'll probably start it up after I finish Gothic 3.
Mount and Blade Warband: I've been playing the hell out of this game for a couple of months now. The mods are plentiful and enjoyable, the combat, while simple, keeps me coming back for more. I'm also working on the last couple of steam achievements I need. I haven't played the multiplayer much, but I'm thinking about it.
Fallout 3: Never finished it when it first came out, not sure why I didn't because I enjoyed it. Trying to just finish the main quest line and then play New Vegas because I'm sure they fixed all of the early problems they had.