First: I'm not a lawyer.
You can legally use trademarks in comparison. Likewise you can have products that are knockoffs and even say "compare to blahblah" so long as the item itself isn't infringing. The line is pretty fuzzy in where you start to confuse consumers though, as it has to be pretty clear that you are not trying to confuse consumers into thinking you are selling the trademarked product.
Also, .org does not offer any protection at all and the original piratebay domain WAS seized. They registered THEpiratebay.org after that, and they have since recovered their original domain.