User blog comment:Derpinator Power/Rarely Played Champions/@comment-24467322-20140806022237

There is a lot more that can be said here. The #1 reason almost any champ isn't played is always "there is another champ that can do all the same stuff, but better". The next big reason has to do with either a lack of mobility/escapes, or no wave clear ability.

Yorick: no wave clear AND no escapes. And his role in teamfights is sketchy. Against a fast clearer he just sits up there and does nothing. He also has to spend so much gold into mana in order to operate properly, he's way behind in other stats. (also i've heard a lot of people say he's just unfun to play) He kind of falls off late game, unlike other bruisers like Irelia.

Viktor: no escape, and his waveclear is shoddy, He needs a lot of AP for his E to clear a wave. Also his W is a "fake-stun", it's like an aoe stun that takes a while to go off and they can just move out of. If you are trying to burst down an ADC that can kill you in 3 hits, you want a stun NOW, not 3 seconds from now. Also nobody likes his hex core lol

Rumble: no GOOD escape, has to use both w and e to escape properly and that means being careful when you use in lane when you would prefer to be able to spam it... Also he pushes too hard with his basic harassing ability leaving him vulnerable to ganks. Also his role in teamfights is sketchy after he uses ult. And if he loses lane, he loses lane REALLY hard. Also hard to farm under tower.

Galio: No escape. He also doesn't have a good laning role. He doesn't do well top (i think) and if you build him squishy like a mage it's very troll because he's so short range. He also runs out of mana really fast if you dont build chalice. I've never seen him jungled. He also has no real way to get in range to use his ultimate properly, which doesnt do damage if they run merc treads and walk out of ur taunt range. Amumu does it better -binds in from a dsitance, instant ult for damage, tanky vs ad instead of ap, can jungle.

Corki: Actually used to be played a lot when triforce was big. His W is easy to mess up, is on a 25 second cooldown (Almost double the timer of the other adc's escapes, and a little bit too long range), he has no real attack damage/attack speed steroid, he's VERY short range, his q is hard to land / easy to dodge and a heavy mana cost. Also he doesn't have a big burst ult for an all in fight.

Cass: No escape. That's basically the only reason. She's also very short range which means you have to play very aggressively in lane and get close and then you can't escape from a gank.

Anivia: No escape. Her q is also really hard to land in lane, and if you don't land it pre 6 u have zero damage. Her wall is also hard to position properly to catch people or block teams off, most people just don't want to deal with the difficulty. And no escapes. And you have to spend a lot of gold on mana to use her ult comboes and clearing.