Skills in 9 were awful too, just in the opposite direction of them being worthless outside of Paragon and a couple others. Low percentage proc rates combined with often low usefulness (my favorite terrible skill is Deadeye, like when am I ever going to need that) made them just awful unless it was Sol or something.
10 I wasn't a huge fan even though they were better just because a lot of them were still pretty worthless and while the prestige skills weren't, they were basically glorified crits.
I hope that 15 scales back the number of skills, makes them much more meaningful with larger and obvious effects combined with not locking them all to class and giving characters skills at base. Wrath and Vantage both really need to be consistent, Vantage needs to not proc (Fates is good about this) and Wrath needs to guarantee a crit. It's fine if it's like Thracia and you can't have them both at the same time, but please make skills reliable and useful.