go's problem is his exceptionally poor breath control, his nasality and the fact that his tone is thin and scratchy. those combined, plus his attempts at belting, which imo indicate a confidence that far outstrips his actual talent, makes him the worst lead singer of any of the boybands to see any kind of success. ymmv but i would wager from the kind of voices koreans tend to go gaga over, he didn't bring in the kind of fan numbers, proportionally, that being the group's best singer normally would.

seungho is alright but he's like just above rappers in any other (non jyp) boyband. at least he's good at being a potato tho!