Guard breaks arnt op as you have just under a second to pull them off, you miss it tough luck, the diffirent factions are balanced to provide diffirent gameplay styles, knights are more tanky, vikings are more damage and the samurai are more agile than the rest, I have never been kicked for inactivity during a fight, but i have lost connection during a battle, which is annoying and i really hope they change from using a P2P networking solution