Honestly, don't feel sorry for Joss Whedon. I don't.
I love the majority of his shows, Firefly and Dr. Horrible being the best, but how can you explain so many series being cancelled by the same guy? It isn't a conspiracy, the guy simply does not make shows that connect with a large enough audience, unfortunately. Not saying that's bad if he's making what he wants to make, but he is in a business that requires ratings and income, so it can't all be about him.
Plus, he's an awful whiner. Nothing that goes wrong is ever his fault.
Buffy had a good, long run, as did Angel. Dollhouse wasn't all that great from the getgo... Pretty much, the only show he's made that was cancelled before its time was Firefly, which apparently everybody loved... After it went off air.
Don't worry about Joss. He's got the New Avengers movie, he's working on Dr. Horrible part 2... He's got plenty going right now. He'll come back soon with a very good, or at least decent (Dollhouse's case) premise for a show, get a season or two out of it, have it get cancelled... And then we'll all be back here with another thread about how bad we all feel for Joss Whedon.