Pirates third baseman Pedro Alvarez is one of the most dropped players in Fantasy (with some people, based on the e-mails I've been getting, opting for Trevor Plouffe and Chris Johnson), and from what I can tell, it's only because he's 3 for 41 to begin the season.
Well, what did you expect? He began last season 1 for 24. He hit .143 over an early 33-game stretch and .214 over a later 33-game stretch. Yeah, he finished with 30 home runs, and he likely will again, but in between, he'll endure some crippling cold streaks. And until he stops striking out every third at-bat, that doesn't figure to change.
But again, none of this should come as a shock to you. You knew exactly what you were getting when you drafted Alaverez. By dropping him now, you only realize your losses, absorbing all of the bad without sticking around for the good.
In Head-to-Head leagues, I can understand you not wanting to live and die by him every week. I question why you drafted him in the first place, but whatever. Lesson learned. But in Rotisserie leagues, you kind of have to let the season run its course. Rest assured, the home runs are coming.