I'm not saying that they're a paragon of virtue or anything, but if you don't have respect for Zynga's abilities then you're missing some really valuable insights. Sure, they "ripped off" the idea for almost every game they've ever made, but as many commenters here love to point out, it's not just the idea that matters, but the execution (setting aside for now the point that everyone steals ideas - remember when those jerks at Google "ripped off" the idea of a search engine?).

Zynga didn't just make another farm game, they used their familiarity with FB's viral channels to make it the biggest silly little farm game on the platform. Then they turned around and used that audience as a springboard for a number of other games that, while derivative, were simply the strongest distillations of their respective types.

I get it, everyone loves to hate Zynga, but the fact is that they are really good at what they do, and lots of people out there enjoy their games.