I like Mohegan Sun a lot. If the dealing speed is an issue for you, I'd suggest the following, based on experience there:
1. Look for a table with several other players. It always seems to be packed when I am there, so finding other players to help slow things down isn't much of a challenge. You might also try getting into a game with some people who are obviously slow themselves, which is probably also not difficult to find.
2. Get chatty at the table and see if you can get another player or two to join in. This is especially good if you can get the dealer to chatting too. I sometimes sit near a roulette wheel and make comments about the numbers coming up. Sometimes I can even get the dealer to look that way.
3. There are so many tables that you should be able to look around, especially at the lower-limit tables, and find a relatively new or otherwise slow dealer. On my last trip I played four hours at a single low-limit table with a dealer and a relief dealer who were both pleasently on the slower side. They weren't real slow, but slow enough that the game wasn't rushed.
The real bottom line there is, in my opinion, if you look around enough, you should be able to find a favorable speed.