Asgardian metabolism would not allow him to get that fat. I dont think compelling is good word to describe Thors plunge into depression. Its pretty 1 note and the constant humour associated with his conditions lessens the impact from a viewers POV. It can be almost considered bullying. Nonetheless, Xaviers ''pity party'' was far more than just losing his legs. It was losing the students, the teachers and closing down his school for the gifted which had been his dream. And most importantly losing his little ''sister'' in Mistique to Magnetos evil ways.