User blog comment:Megames1/Against the Meta- (Insert X Champion) is UP/OP because (Insert Y Reason)+More/@comment-83.27.151.184-20121111122045/@comment-69.206.240.248-20121111194746

Teemo is also easily shut down and Fiddlesticks, though he can be quite powerful, is also very easy to shut down as well.

Teemo is very squishy and, consequently, now humorously has the reputation of having the most deaths in LoL, averaging something like 75 deaths a second or something along those lines.

Fiddle is relatively mana hungry and his spells are also fairly short-ranged relative to many other AP casters. This balances him out, imo. This makes him more difficult to play at mid and he's already infamous for having a slow jungle (difficult to gank pre-6 thanks to short range on fear). In exchange, he brings a lot to a teamfight and can be devastating late game.

And Darius can snowball quite hard but I wouldn't say he's particularly OP. Anybody can be powerful if they snowball hard enough.