Warsow 2.0: An arena-style first-person shooter game

Quake being primarily multiplayer-oriented? I beg to differ; Q1 was essentially a single-player game with some multiplayer tacked on (it had a grand total of four deathmatch-specific maps, and wasn't designed to be run over the Internet at all). Q2 much the same. Q3A was purely multiplayer, this is true; Q4 I don't really know (I never played it much), but it certainly had a single-player campaign.