The best combat I've seen to date is in M+B:Warband. If you have a duel with an equally talented player it can last for minutes. If players have some serious tactics they can end fights in seconds and if players are being mobbed then they can sometimes win if they fight like demons.
I'd like to see a similar system used in Xsyon but really I'm only concerned whether player skill will ocme out on top of character stats.
Also, a question about the combat system. Will there be friendly fire? In melee and ranged?