It is very important to know the performers before you go, especially those who have been in Vegas for a couple years. Doesn't take long for the reputation to get around. Vinnie has a certain rep, and if you don't know about that going into the performance you are not going to like what you get.
Carrot Top was hilarious, saw him years ago at the Luxor.
I would think any of the comedy clubs would be "safe" because of their multiple comics per night. If you don't like one then there'll be another out soon.