I so so agree with you :/ I like Jjong's cockiness and his arrogance (I mean, come on, I love Key to death because the same reason xD) plus Jjong is really modest usually, he just like to say how much he's proud of his voice and how much hurts when he fails or something like this. I think it's kind of normal for a singer being proud of such a gift and being a little overconfident, right?
I like Onew's voice, he has a GREAT voice and it's beautiful, I prefer Jjong's because it's a little unusual and higher than Onew's, but they're both awesome singers =_=.
Everyone on Omona were complaining about Jonghyun and his voice, saying things like: He can only scream. RIIIIIIGHT. I guess those people are the same who started to like SHINee when Lucifer came out and the whole group were pretty much tired =_='' so they made some mistakes.

*-* that performance was fabulous!