Check in was easy and reasonably quick. The hotel was busy and there was a line at the front desk but there were enough staff on hand and we waited no more than a minute or two. The staff was very pleasant and welcoming. Complimentary valet parking is a nice amenity considering the cost of parking at many major hotels.
There are 3 things that I look for in a hotel.room. It has to be clean, it has to be comfortable and it has to be quiet. I was a little surprised to find that the Mohegan Sun exceeded my expectations. The 450 s/f room was spotless clean, we literally did not hear a sound all night. No voices in the hall, no machinery and no TV noise from the room next door.
The hotel will add on a $15 "facility fee" supposedly for WIFI service among other things. Unfortunately, that serves to offset the free valet parking.