We stayed for 3 nights with our two kids in a suite with two queen beds. The suite was nice overall.
The biggest pluses were the courtesy of the front desk check in person, and the dependable, well-stocked breakfast bar every morning. It makes life away from home easier, with one major meal taken care of for the kids. The bar fridge and microwave in the suite were also handy for travel with kids and heating easy meals. The pool was nice (used once) and gym looked nice (did not use).
Downsides - the sofa was wonky to sit on (we did not use as a sofabed, which might not have been great) and the bathtub had dry scaly adhesive residue (from way back that hasn’t been scraped off and was chipping off), but was clean. While the hotel doesn’t have EV charging, Mohegan Sun does, and that helped us out. Interestingly, Mariott charged us for “data usage” at ~$5 a night even though none of us remembers agreeing to get a better wi-fi for a fee beyond the free/ complimentary wi-fi.
Overall, good place and close to Mohegan Sun Casino, and many museums (submarine museum, bowling, tantaquidgeon) for a reasonable rate. Would stay here again.