LB didn't sell out at all, I actually thought Chocolate Starfish was just like any of their albums, songs with too many fucks (I love those songs BTW), "fun" songs and more great covers. Actually, I don't see LB selling out at all, Fred is who he is, hate him or love him, he's actually one of the most genuine artists out there. Their new album is great, Wes Borland is back, all is well in Limp Bizkit town.
The most common LB hate comment I hear is that rap/metal crossover is not meant to work but RAtM is one of the most legendary bands ever (arguably my favorite). The other arguments is that they make covers, well RAtM made alot of covers too. If we go further, people seem to really like Linkin Park but they are a Nu-Metal band too.
I think the only reason people hate on LB is because of Fred, he's really a hit or miss with people, but like I said, he's not someone who's gonna change himself or his music because of opinions and IMO, that makes a great artist.