I don't have too much trouble defeating a 2h stab as a lancer. It is important to not stab too early, and thus give your target time to position himself accordingly. It also helps to slow down suddenly while charging your quarry--it fucks em up.
Of course, being a lancer, I tend to completely avoid direct confrontation. It is much better to pad you k/d ration with dozens of afk, naked, xbow, noob, and archer kills.