Yeah, I mean...kind of (with it having a campaign). But there's no real major story or anything here - this isn't say Quake 1, Quake 2, Half-Life 1 or 2, you know.

You're just going from map-to-map, defeating enemies - and trying to get to the top. You're going after Xaero, IIRC.

EDIT - Wow, bring back memories...but Tribes: Vengeance had an interesting Single-Player campaign, which mixed some SP style campaign stuff and skirmish match stuff.