From discussions on FT and elsewhere, many people do NOT like to play at Indian Casinos. The slots are type 2 (essentially you are playing against a pool of players--like Bingo), while Vegas and AC are type 3.
Some people, particularly table game players, have been "fleeced"--and your only recourse is to the "tribal council"--who do you think they will favor, YOU or the Casino?
Re: the subject of this thread, Platinum in AC get discounted (or free) parking, can ride the (free) shuttles between the 4 casinos--besides the posted benefits at Harrahs.com.
Not all Indian Casinos are class 2. Many are now class 3. Also, many, such as Mohegan Sun and Foxwoods operate essential as the casinos in AC and Vegas.
Actually, my favorite casino in the country is
Mohegan Sun.