I think Meshuggah are brilliant. I however find that the vocals are pretty good but I'm into that kind of thing. You can understand everything he yells/screams though, unlike a lot of death metal bands.

The rythym is extremely unorthodox and I take pride in being able to play New Millenium Cyanide Christ, with the opening riff's bars, 23:16 x 5 then 13:16. Some of the lead guitar is quite good too, almost hypnotic.