CSI is the awesomest! I love how you as the viewer can follow on and try to figure it out along with the team. I also like how every episode is different. It's never boring to watch, that much I'll say. And to be honest, I think this show is extremely realistic, although it is prety graphic. Sometimes it makes me wonder "can this really happen?". They've picked out a good group of actors for this one and they seem to really work well with eachother.
I also recently just got the game for DS and I think it is very close to the show and the CSI writers are doing a fabulous job! I love CSI!