I'm a bit in TAC's camp. I like OSI, but I like the stuff that is heavier. Kev's voice is ok, it is monotone and lifeless at times, but it sorta fits the vibe of what they do musically. Even the rockin' stuff, it just works with it. I can't explain it.
The heavy electronica-type songs are usually ones I struggle with. But when they get heavy (i.e. The Escape Artist, etc.) man that makes up for it.
I really liked Blood a lot. Probably my favorite out of all three.