I may get Far Cry 2 in the future, when the price drops and I have more time for games in general. I do like large, open-ended maps much better than the typical assault course maps seen in a lot of FPSs. That was one of my favorite aspects of Far Cry 1 and Crysis.
The respawning enemies are probably the main thing keeping me away right now. I have seen other games like that and it always annoys me, since you don't get any sense of accomplishment if you have to keep clearing out the same areas over and over again. The COD games and Assassin's Creed also had this issue to a lesser extent.
i got the game free with my gtx260. i pretty much like the way it is. sorta like elite/privateer/tachyon/freelancer, but in an fps game. really its no different. you run around pretty much doing your own thing, you have story missions, side missions, youre free to explore and treasure hunt. theres no running out of ammo. theres always more at the weapons shop or at the checkpoints. i mean if that kinda game kicks so much ass in a space ship, why not as a guy behind a gun.
It's great that a game lets you explore freely, but there still need to be interesting things to do in the game world. This was the problem with Freelancer, for example. The game world was big but there wasn't much to do apart from just flying around and seeing different systems. The randomly generated missions were incredibly boring and there wasn't much variety in the stuff you could buy.
My personal hint: Wait until Riddick: Assault on Dark Athena comes out in Spring for PC, 360 and PS3. This going to be the next. The first Riddick was a PERFECT game (something incredibly sparse!) and this new game is just a huge love letter to all the fans. It's even included here as a remake, with new shiny graphics.
Yes, this game could be great. I wouldn't say Riddick:EFBB was perfect, only because of the very short length, but it had no real flaws apart from that and many innovative ideas.