I'll start, trying to remember them all from over the years. We are in our 60's, by the way, so we are pretty easy to entertain with stuff the younger set may not like.
Legends in Concern: Fun show, you don't know which impersonators will perform the show you attend, but all we've seen are good enough and some outstanding.
Jubilee: Some call it corny. I wouldn't argue, but we liked it a lot. An "old Vegas" type show, some showgirl/feathered costume dancing stuff but that's not all. Good musical acts. Multiple costume and set changes done quickly. Entertaining. We would go again.
Defending the Caveman: Forget about it unless you need somewhere to cool off from gambling for an hour. Lame, one guy telling recycled anecdotes about marriage, etc. Probably the lamest show we've ever seen in Vegas. I almost felt sorry for him, his stuff was so lame.
Vinnie Favorito (spelling?): Very funny, if you aren't offended by insult comedy and blue language. He picks on people in the audience, so avoid the first two rows or so if you don't want to be singled out. He isn't a mean comic, pretty much good natured taunting.
Mac King: Family-suitable comic magician. Very entertaining. We'd go again.
Rita Rudner (she might not be with Harrah's now): Liked her show a lot.
Improv: We always liked Improv shows. Usually 3 different comedy routines. Some are better than others, but we never went away dissatisfied. That was actually where we first saw Vinnie. Some use blue language, but not mean spirited.
As others chime in with shows I've forgotten, I'll chime back in!