If I'm not mistaken, surface damage only depends on your level, on of the reason, why it is so pointless. I'm mean sure, in the first game the damage of surfaces itselfs was never that big of an issue either, but at least surface could inflict DoT or CC, both is now kind of gone, as long as you have enough magic armor.
1 Attribute point for 1% of critchance more does not sound really valuable compared to 5% more damage, so wits has hardly any value.
Playing tanks sucks in this game, except if you join it with Glass-cannon, which just shows how broken the AI is. Sadly they made the AI to smart now, you could say. Larian has really an issue with overdoing stuff.
Leadership sucks anyway. In the first game it was cool because it could give your team nice boost and fear immunity and because the range was defined by sight and not by meters. But honestly all skills lack depth compared to the first game. It is so disappointing.