Why is Kassadin banned so frequently?

[quote=jacklyon]I've played a few games as Kass since he's free and I love mid, but I just don't really see why he's such a highly-banned champion. He's really annoying, and great and cleaning up (obviously) but he feels pretty balanced to me at least... Am I missing something?[/quote]

[quote=Zoki]Hes OP. Nuff said.[/quote]

[quote=Lugignaf]Ranged, [b]spammable[/b] silence that lasts about as long as the CD, combined with a flash that pops projectiles... I think he's really, really strong.[/quote]

[quote=aviseras]He's an extremely mobile AP assassin who can constantly poke/slay squishies without ever needing to get into much trouble. In general, he's a headache to deal with.[/quote]

[quote=Zell]He generally counters most mid-champions and has a low-cooldown stronger (further range) flash ability with his ultimate, allowing him to generally take an extra offensive summoner spell since he doesn't need flsah. Along with this: [list] [*] Relatively low cooldown long silence (2.6 seconds max ranked) [*]A cone skill-shot snare. [*]Easily snowballs [*]Very strong late-game. [/list][/quote]

[quote=NinjaGinge]Yeah everybody here has given it a good summary. I absolutely despise dealing with opposing kassadins[/quote]

[quote=PsiGuard]His silence allows him to out-burst other casters when his damage gets high enough since they can't nuke him back with a full combo. He can also win damage trades in lane fairly consistently. Combine that with the fact that he's one of the most difficult mages to chase or gank, and he's a pretty strong champion. I'm buying him as soon as he's off rotation.[/quote]

[quote=InfHaRM]like they all said, and his ult i rather dumb, it's like oh, i just ganked bottom, got kills, and now i got some mad people chasing me. im rocking 500 mana so i'll just ult away 3 times. Makes sense.[/quote]

[quote=Samoh]Easy escape, beast burst and fair poke. Well played Kassadin is terrifying, and not hard.[/quote]

[quote=Thalia Kael]Has nice escape on like 6 cd, nice burst, nice poke, long silence, good vs enemy AP carries[/quote]