New Vegas feels more like Fallout 1 & 2, and is better off for it. An open-ended plot with tons of opportunity for actual role-playing, and any issues with the game can be fixed with the absolutely insane amount and scope of modding.
I've had so much fun in this game, you'll hardly believe it. I like this even better than it's predecessor Fallout 3, as this one is closer to it's roots (Fallout 1&2). Extremely good gameplay, story and graphics makes this an unique singelplayer experience. Furthermore, FO: NV can be modded to kingdome come, further improving this already great game.