Bobular said:
can the 360 play original X-Box games?
More often than not. The only game that I had for my original xbox that didnt work on the 360 was Need for Speed: Most Wanted. Other than that, every Xbox game that I owned worked perfectly. There is also a (fairly limited) original Xbox store on the marketplace.
As for 360 games. I would strongly recommend the Halo series. You can get Combat Evolved Anniversary, which is a (very well done) remake of the first Halo game, 3, ODST, Wars, Reach, and 4. ODST, Reach, and Wars are spin-off titles, with Wars being an RTS. None are essential, but I found a lot of enjoyment in all 3. Opinions on 4 are all over the place. Considering that you can get the entire Halo series second hand for around ?10, its worth picking up and playing them all, anyway.
Gears of War is okay. You can get a remastered version of the first game on PC, so I would really recommend getting that, because it does improve on the gameplay, but otherwise, the 360 version is perfectly playable. Otherwise, you can get 2 and 3 for cheap on the 360. The series is pretty fun, but if you really dont like cover-based shooting, then Gears probably isnt for you.
Fable is qwerky. Its a fairly basic adventure game, with an interesting enough story, and a charming art style. If you're looking for a challenge, then Fable definitely is not for you, because FUN FACT, you can't die. Again though, for the price, you cant really go wrong.