Actually, after training the sword&board on the duel server a bit, jump slashers were the easiest people to kill.
A 2h who didn't jump at all and just knew he'd hit me first was impossible. Playing sword & board cav is perfectly viable on the battle server, support and backstab, the problem is just you have or had no advantage against a lancer at all, they can do all that just fine, and you must outmaneuver them completely to win a cav vs cav fight.