It is amazing... Takes everything good from GTA and Red Dead Revolver.. PLayed quite a few hours of it so far and the missions and story are developing good. Haven't played online at all though.
Missions can be technical but nothing is too easy or to hard. (Except riding horses. That **** is hard.) Graphics are really good for xbox360 and you lose track of time playing it. Definitley worth it. Also if you have some games lying around. There is a deal at gamestop right now where you can trade 2 decent quality game in and get $40 off RDR.