I actually think the actor has done an incredible job of showing his sort of powerless rage through the series from what little we've seen of him. Is there likely to be further plot for him beyond being another Ramsay plaything?
this wasn't a bad scene, his one one one vs Ned was believable and 'good' by shows standard, better than most dual wielding we saw in most movies imo. Still dual wileding swords sucks true. Dayne fighting agianst 4 at once was a starwars like chreography, but to choregraphers credit he did movie Dayne out of the circle ASAP so he did try to face all 4 from same direction. This scene was to highlight how much of badass Dayne was. It's 100x better than anything involving sand snakes cmon, it wasn't much better at the shows start.