If he's doing very well with chelsea and done that then it's understandable the anger but most of us wanted him gone even before that. Had it not him having a lil bit of backbone (money wise) to resign then you people would blame him for stinking the place. His tactic got found out, he's not wanted by the fans then what's he supposed to do? You do realize he actually didn't stink the place until he got sacked like many others would do in his position, right?
And it's a surprise that you're actually buying the club statement in blaming his departure for ruining the season considering you never really rated him in the first place. If he's not that good then the sooner he goes the better don't you think? The club in ruin is mainly due the board incompetence for not replacing him correctly and sooner.
The outrage towards him seems like a case when a girlfriend wanted a break up but get upset when the boyfriend beat her to it.