Rev is too short: only six measly episode per series. And only two series, so far. But that might not be a bad thing. Like Spaced, it might just be two series is enough, the perfect amount, and to go any further would be to ruin something lovely, and it could end up on Series 4, and go all rubbish. Like Prison Break.
The writing in Rev is - in some places - absolute genuis. The characters are splendidly acted, and the dynamics between them are sometimes subtle and touching, other times violent and sweary.
I particulary like the Archdeacon, who always pours his coffee away. I don't know why that makes me laugh; it just does.
Summary: watch it. You'll like it. And if you don't, Jesus will hate you.