Yeah. It's almost unfair to compare the Build games to Doom.
Though I still play Blood on a regular basis and am trying to beat it. It does have a pretty interesting plot, which is something I can't say about most FPSes.
Tell me about it. All I know is that its for Macintosh (which, unless there's a PC source port I'm unaware of, makes it beyond my reach) and that it was by the guys who later went on to make Halo... altho the latter isn't exactly something that makes me want to play it.