One of the things I've always hated in this game is the various combat animations, specifically class attacks that hide your weapons. Nothing like seeing your beautiful weapon disappear right before your eyes when you use Surprise Attack as a Nightblade that briefly replaces it with a visually dull animation. Each class should have their own unique animation for each ability.
All that I'm looking for personally is just to update these animations, like the previously mentioned Nightblade ability have your weapon(s) be displayed at all times and have it glow red perhaps leaving a trail from your weapon, other than that the animation isn't too bad itself in terms of movement. However, abilities like Crystal weapon, Lave Whip, Overload, etc desperately need updated visually.