People often say "It's easier to criticize the work of others than to go out and create something yourself."
And to that I reply, "Yeah, I know, that's what I like about it. It's easy. Really, really easy. You don't even have to leave your house."
I mean, think about it for like five seconds. Creating something takes a lot of time and effort, even if the thing you make comes out all crummy. And even when comes out really good, you're still going to have some jerk who never bothers to make anything for himself telling you how crummy it is.
Criticizing someone's work, though, can be done with almost no effort, thought, or time. And when you're done, no one is there to tell you that you're wrong except the person who created it in the first place, and you can always say that he's just mad because you pointed out how crummy his stupid thing is.
And it's not like you have to create things in order to know if they're good or not. I don't know much about cooking, but I can tell when something tastes bad. And once I've determined that something tastes bad, I can expound on how terrible it is at length, even if it does make the free sample lady at Sam's Club cry.*
*No, not really.