I always play Quake 3 multiplayer. You can chose bots against you, are just blow the others to pieces... Aahh fun, fun, fun.

I tried AvP and it was indeed fun to do, especially because all 3 species need different ways to play them. But when we play multiplayer (almost the only times that I still play), than almost nobody knew it and they (aliens/predetor) were not easy if you've never played with them... which make us take other shooters.