All the combat skills are disappointing. I think they should do the same thing as in D:OS1 where if you don't have a the proper skill tree level for an ability you have, you get an AP cost increase. +1 AP cost per skill level needed would be fine (meaning better skills would need more investment, just as in D:OS1). I do like how the passives can be useful for various characters (e.g., Hunstman being good for mages).

Single handed should definitely have a bigger accuracy bonus. Accuracy should be its forte, imo, since you sacrifice a lot of skill damage to go one-handed.

It's also a bit weird there isn't a straight "shield" skill. I guess the defense skills improve shields, but it'd be nice to focus more directly on shields.