We arrived in Mammoth after dark as part of a road trip and decided to try Tamarak based on reviews on this site. This is very much the old style "lodge" and our room upstairs was tiny (basically awooded box) with little room for anything other than the bed - with bathroom down the hall. It was fine for an overnight stay but I wouldn't recommend for any longer. The lodge also charges a resort fee (not sure why) for a very basic breakfast and wifi that was not working at all during our stay.
I must say the surroundings though are beautiful, and the person to check out out was great and gave us some good tips for the rest of our road trip.