I don't mind the "premium suites" at the MGM, but not a fan of how low their ceilings are in the basic rooms. The casino at Mandalay Bay is a joke.. it's like the casino used to be a giant convention room and they decided to put slots there.
Mirage's rooms feel and look like MGM's renovated rooms at the Grand Tower. Renovated and has a nice feeling but the bathrooms are just meh. Never been to a suite at the Mirage though...
Personally, I think Aria and Cosmo have the best basic rooms on the Strip. Never been to Wynn so can't say...