User blog comment:TheTobarMethod/Why is Mid one-sided?/@comment-74.101.120.60-20130317022538

The current meta on mid is mostly squishy ranged casters. Sure you have exceptions, but the majority of APC's played on mid are champs like brand, TF, and so on. Kassadin and LB are both mage-killers, like Dota's anti-mage-they're made to take on the squishy apc mid setup. Fizz is great at dodging... everything, and is untouchable by your average player using a skillshot champion, which is pretty common on mid. Even non skillshot champions can be easily outplayed by a decent Fizz. Malzahar i don't see much-no intel here! and katarina tends to play just aggressive enough to get the kills she needs to snowball without the laning phase being quite as important the way it is for most other champions. Essentially, the champions you pointed out tend to stomp on the farm-dependent squishy APC meta that's very common on mid these days, imo, so that's why they seem so effective.