Criticizing a singer is fair, as long the criticism is actual criticism and not just "LOL THEY SUCK."
Yes, I was talking exactly about that type of comments, and similars..
Anyway, you're missing the point.. I'm not (
only) saying is unfair to simply judge like that someone who's representing -or trying to represent- some form of art for the whole people to enjoy! (I mean, I can't even...), BUT that it is unfair to focus always in the singer.. Like he has to be the band's most perfect performer.. Where does that come from?..
He's precisely the one who has the most difficult task at any show.. Not only to sing good, but doing it wihtout any material reference (like the other members have with their instruments), being the one interacting with the audiencie (a thing that takes him away time that should be used to recover the air in order to strain the throat as little as possible), etc, etc..