I bought Perfect Dark Zero because I thought it was going to be as good as the original. I was wrong . If you asked me it sucked.
*edit*
I really didn't have many 360 games and the ones I did have I only played online. When I got Perfect Dark(used because I'm not an FPS fan) I didn't have XBL so played multiplayer with some friends at my house. Two people actually. How big the majority of the maps were, it sucked with three people and I would say you probably need a minimum of 5-10 to have a somewhat enjoyable experience on most maps. The guns were crap too in comparison to the amazing ones they had on the first game.