User blog comment:StrategicMagic/Carry by Proxy - Why (Some) Assasins Don't Fall Off Late/@comment-83.196.94.64-20121207010258

also a big issue iof leblanc is farming:

on champs like karthus or orianna you can easily get 300 cs in 30 mins

on leblanc you'll be proud having 200 at that time

and yeah that makes  6 kills at least so basically you have to get really fed to have the same amount of gold  as a farmy mid,  AND orianna and karthus are MUCH  stronger in teamfights

and i honestly dislike leblanc mid (not like she can go on other lanes) because it's just taaking a pick extremely strong in lane ( chose the easy way) and then getting carried because you're useless, but HEY  you won lane so it's their fault you lose the game, it's not because the   karthus on the other team  who's at 5/10     takes half the health of your whole team and gets your team aced