The only thing giving this an above average rating is the location A review of Mammoth Mountain Inn
My husband and I just got back from a quick weekend trip to Mammoth. We took advantage of a great deal for the Mammoth Mtn Inn. I had never stayed there before and was pretty excited. We had a one bedroom condo. I would STRONGLY recommend that if you stay outside the main lodge (can't comment on that, since we didn't stay there) that you get a second floor room. We were on the first floor and heard every noise from the people above us. Also, do NOT stay near the soda machine. The rooms must not be well-insluated, since we could hear everything outside the room.
The staff was very attentive, but a major complaint I have is the lack of hot water for the shower. After a day of skiing, there is nothing better than a hot shower. We had lukewarm water at best. The staff was attentive to our complaint but the situtation was not fixed.
I would not stay in this location again. The location to the slopes was great, but the price was not worth it. Like another reviewer said, there are tons of much nicer slopeside places in other resorts. The town of Mammoth is small enough where I don't mind driving to the slopes. If you don't care about a little noise or hot water, and have the $$$ to spare, this is your place.