1) Spiderman 2: Got a LOT of praise, and then suddenly a lot of criticism... How is it after the hype?
The game is well developed; it's just that the free-roaming missions only have several variants. 1) guy on ledge 2) person who needs to go to hospital. 3) kid's balloon (can't use webbing) 4) gang vs person 5) gang vs spidey (person is a decoy, they apologize) 6) bank robbery 7) save people from boat. There's also a few swing through rings and beat-the-clock missions, and I might have missed one or two other generic battles. It's pretty easy to get tired of it (GTA was the same for me). for <20 used, it's a good purchase. Full price? Nuh-uh.
2) Burnout 3: I have PGR2, and I'm not much of a race fan. Crashing however, sounds like a lot of fun. Is it fun on split-screen?
Dunno yet; I get mine today. :evil:
3) Beyond Good and Evil: Still haven't bought this one, but it seems like a short game...
I'm underqualified to answer this one; I've not played it. BG&E is well loved in these forums and with reviewers. It can't hurt to try it; you might even be able to pick up a used copy.. I haven't seen too many of these in the used games places. I'm not much for platform games so I wouldn't be buying it.
4) Fable
Ask me next week; I'm buying it for better or for worse. I love Pete's sandbox games so I'm sure my creativity for mischief in the world of Albion will yield a truckload-o-laughs.

On another note: Would Doom3 run on a AMD 1.2 Ghz with a Geforce Ti4400 and 512 MB RAM?
I don't see why not( you may have to overclock to 1.5Ghz, I don't remember the exact base requirement), but you're going to have to turn down everything that made Doom3 impressive. The game itself is basically survival horror for the first 2-3 hours, and then it shifts down into a mindless "oo, ammo... I wonder which walls will slide open to reveal imps who have been waiting tirelessly for some idiot to come by and grab it?" Over, and over, and over and over again. Once you get to that point, only the hell levels will impress you with their design. The traps? Same old, same old. If you're patient enough, wait for the Xbox version to come out (no hardware worries, coop, get the same toned down graphics, etc..)
And a final question: I have Hunter: the Reckoning. I bought it cheap for coop-play, but me and my buddy don't like it. Are the other RPG-lite games the same? D&D Heroes, BG... ?
Hunter is kinda lame, I would recommend Baldurs Gate 2 or Lord of the Rings : Return of the King before playing another hunter game. Once again, use trade-ins and used copies to keep your cost down.