For me it is probably Datsyuk, through no fault of his own. I just despise how everything he does is treated as an act of a god. His nice goals get treated like the GOAT. Crosby scored one just as good as any Datsyukian one the other night and no one cares.
He is the most overrated player of this generation in my opinion. He is a marginal HOFer based on his two-way game who is treated like a generational talent.
For these reasons I like to see him fail and therefore like him the least. He's probably a great guy, but oh well.
Case in point:
This could honestly be the reason I don't like Sidney Crosby
I get how talented the guy is, and I definitely respect it. But he will get praise for the easiest passes ever or goals. And ironically enough there was a pass that Crosby made a few years back (if I find it i'll post it) that everyone was fawning over that Datsyuk ended up doing before without even looking. And I can see where you're coming from with some of the Datsyuk love, he's my favorite player but I wouldn't rank him in the top five in the NHL like some will. Though alot of the things he does though definitely earns him alot of deserved praise though IMO, especially with his moves and some of the passes and play he creates. Some of the things he does are things no other player would even try...maybe not the best on the planet but he's definitely one of a kind.
And in a matter of fact (no fault of his own mind you), aside from his on-ice antics sometimes, his fans are a huge reason I don't like Crosby, because like you mentioned with Datsyuk, he apparently can't do anything wrong in the eyes of his fans. He can slash people, and start fights then hide behind teammates/refs and its all okay because he "takes alot of abuse during games". And then some people will complain when haters criticize his poor play because he is "in the spotlight all the time" when generally his fans will put every little thing he does in the spotlight themselves. As bad as his haters are (I'm definitely one of them), his fans are JUST as bad.
My other disliked players (Lucic, Marchand, Cooke, Neal) are pretty straight foward