I think the skill trees are fine, my issue is Talents and loot, which seem to me to be a lot more important, but hey everyone has their own axe to grind.
But I think skills have an issue...so I can empathize with the view here.
To me, combat skills or anything that makes a character more effective in combat are gonna supersede any other consideration. It is already hard to have to take some things that are not useful in combat, Barter, Pet Pal, Lockpicking, Pickpocketing, crafting, blacksmithing etc etc, all detract from resources that are needed to increase combat ability, nevermind that they have important uses some of which can affect combat, -Blacksmithing and crafting to make better swords or repair combat damaged items for instance, barter to buy better armor or weapons, a higher level in Pyro, Aero, or Hydro magic for more better combat spells. It is a resource juggling game at that point, where do you get the most mileage?