It is not "inherently" bad, to be honest. It is basically a more modern 9gag with a severe case of Repostolitis going on, and their watermark is as unneeded as 9gag's. Some people get a bad impression from that, seeing it as a type of "unfair content appropiation" of sorts, so the site has a bad rap to it.

Other than that, the content posted there is quite similar to what you see here, but by more people, so the bad/unfunny stuff is more abundant and, without a proper score system, hard to filter and see the good stuff only.

This explains my personal disdain towards them.