Hey, I thought I would put all of my thoughts and ideas on the skills in this game all together in one post.
The first issue I thought I would mention is the scaling of skill powers. As you level up your stats and purchase new items, your character's standard attack damage increases. Your skills' damage levels have a much more fixed cap on them, and there does not appear to be a way to increase that. For example, if I remember correctly, Regulus's snipe attack does 600 damage once all of the possible ranks of it have been taken. On the other hand, if you take the stat upgrade when you level up, and buy weapon damage increasing items, you can get to the point where Regulus puts out comparable or better damage by using his vanilla attack than by using his special skill. Since each character has only four unique skills each, they should be as useful and versatile as they can be. Maybe allowing a character's items or base attack to add on top of some skills' power would be good in some cases?
Obviously this will all be subject to rebalancing as the game progresses towards release, but I think it bears consideration.