there's a few good games depending on what you like.
- Oblivion GotY (RPG, no multiplayer)
- CoD4 (shooter with the best online mode ever. fact, it's factual.)
- GTAIV (lacking in side missions but very funny and should last you a few weeks)
there's alot more but they're the best 3 out atm but if you see Uncharted for £20ish it's a must have.