I like L&O because I thought the half police/ half law stuff was a different approach and it worked well.

I originalyl liked CSI because of Grissom's character, and I kept watching out of habit.

As for CI- we watched a lot of it, and I like D'Onofrio, but when we were watching it it was a time when we were watching a lot of trash procedurals so it kind of faded into the background. I may go back and revisit it some day.