XBL Arcade Unplugged is a good way to get you started on the X360...
The biggest downside, for me, is that the games are boring. I like games that are fun to play and have easy-challenging achievements to have something to aim for... unfortunatly, some of these achievements are like almost impossible, or really hard to get, and arent worth the 5 or maybe 10 gamerscore pts..
My reactions are mixed, and if you didn't get this game for free with the console, but you still want it, check a bargain bin or buy it brand new, but dont b dissapointed.