Some players are out of control.....but I think instead of limiting their ability to achieve ommipotence could we:
Include siege KDR and performance in character history.
Have an autobalance that takes into account generation, KDR, general performace (wins, losses, teamkills, etc) and then balance accordingly.
I love watching those 5 or 6 guys stood in the village square, as 20-30 lesser mortals come crashing towards them, confident that this is nothing they have not seen before and survived....
And the last champion, 17th of his families line of epic heroes, atop a pile of his enemies that await him in the next life (dead chat), going down under the many assorted blades of the peasant masses....
So, in short, allow the pwnage, but ballance the matches for it, with either very superior numbers, or others of such calliber, opposing the supaheroes, and maybe disable the clanflag stacking if that still works, seems bad idea.....balance wise....