People ask me sometimes what do i think, which is best. Well it's really a matter of taste, but if you ask me MD2 is much better. Why? Well: 1.) The graphics are a little better. Yes BO has a better defined soft edges but the ambient is too dark, for me the only playable map is ,,Nuke-town", because it's the brightest one. 2.) I don't like the money concept. Why oh why did they do that. I bored myself trying to gather money to buy the attachment's i wanted, but i did like the wager matches. 3.) In MD2 it's much easier to aim and shoot, while in BO i shoot a whole clip and i bearly scratched the guy, it may be because i suck but in MD2 i was always on top of the scoreboard. 4.) Weapons are somewhat better in MD2. The only weapons i liked where the AK-74U and the Ballistic Knife. I don't know if this helped you decide which is better or which one to buy but if you ask me MD2 is much better and i would chose MD2 over BO any day.