User blog comment:Deshiba/Ban champion X!/@comment-8802138-20130811183557/@comment-4022742-20130811185131

Uhm, but what bans are unworthy in this system? would be really hard to check. If you give every person 3 champs, there's bound to be some overlap too, so it's really unlikely to get 15 banned champs.

You can however, catch pre-mades. Easy fix in that 3+ situation is having the first 3 bans count, the rest gets flushed. And as per not having enough champions, just up the requirement. I really feel everyone should be Lvl 30 to play ranked anyways...