Blood

The Good
Not much really. It has excellent controls and a good variety of weapons, which make it a truly excellent multiplayer game (also has some good multiplayer levels). It's not a good game mind you, it's just amazingly fun in multiplayer gaming.

The Bad
Blood has among the most terrible engines to date, filled with bugs and horribly slow (but what'd you expect from Ken Silverman, the man solely responsible for the catastrophe named Ken's Labyrinth?). It less than makes up for it with unbelievably terrible graphics, horrible one player experience, terrible sound effects and generally crappy gameplay.

And who the hell heard of raycasting in 1997, for Christ's sake?!

The Bottom Line
Blood is crap. One of the worst Doom clones ever to come out, it somehow makes up for it by being a great multiplayer game.