I suspect you'd get a lot of reactions if you said Crosby sucks. GSP and Crosby are lightning rods for criticism and jealousy because they are winners. Success generates envy. It's more a reflection of their critics' insecurity than any deficiency in Crosby or GSP. The same posters attacking them again and again tells you how great they are. Nobody would devote countless hours trying to tear down Carlos Condit or RDS.
That being said, both Crosby and GSP are open to valid criticism. Though the best player of his era, Crosby has never dominated the way Wayne Gretzky, Bobby Orr, or Mario Lemieux did. Crosby's statistical accomplishments have also been mediocre compared with the "greats."
Similarly, GSP had 9 or 10 title defenses and is generally regarded as the best WW of all time and one of the P4P best (heez stock keeps riiziing now that Jon Jones and Anderson Silva have failed PED tests). However, his inability to finish opponents when Silva and Jones were gives the fans and detractors something to grieve about.
Holy shit, I had no idea I would block the idiots. Thanks that will save me from wading through a lot of nonsense.