While you may not like it, others do, so "piece of crap" may be a little inappropiate. I can imagine some things that might be boring for you, though.
But, before i buy a game, i usually take a look at the rating the game got from different gaming (related) sites, i talk to people who might have played it, or at least ask them if they know anything and so on.
And then, i buy it. Or not, if i'm not convinced. As far as i know without thinking long about it, i was never wrong. Some may be better then others i bought, and some worse, and perhaps i missed some, but i would call none "piece of crap":
Didn't you take a look at what you are buying before doing so? If not, you shouldn't complain. If you did, well, bad luck i guess.