yea i guess people wouldnt use it faithfully, maybe only the clan leaders could use it or something :S
I don't think taht would work out good at all..What will a clanleader probably do if he/his clan looses against another clan? So you will have a lot of clans with minus ratings and barely + ratings (Why would a clan leader give an opponent a good rating?)There may be 2-3 leader who'd vote correctly, but with all the pub/newer clans around it won't do well.If theres a clan-karma-system it should be regulated under objective factors and persons.