Let's look at LCS (because, even if it's a few player, we all know that they won't gonna change the ban system if it's bad for the "pro" team :s)
what I want to say is that, actually, if you want to counter the top, you ban maokai lulu and nidalee/alistar.
All top laner can play them, so wathever who you ban, there will still be one left the ennemy can play.
Jungle, it's the same, nunu lee sin elise and eve are the common pick, if you target a under use pick someone master well, at least 1 of the 4 top pick will be left open and they all can play them.
Mid is the same, orianna syndra ziggs and xerath rules them all
Even in support role they are 4/5 good pick that all of them master.
With the current 3 ban, targeting someone is impossible, and that leads to this feeling of seeing the same match again and again and again.....
With more ban, maybe something new will pop out