Ditto on MGM. Lots of kids there who don't really seem to know how to play. I also found the $4/8 game to be really fishy with older adults not really knowing much about the game.
The Bellagio's $4/8, being the poker room's lowest limit for HE, also is pretty fishy. Add Aladdin's $3/6 and downtown, Binion's (the former Horseshoe)... The Wynn's $4/8 also seems fishy and is a pretty nice place to play.