I agree with Stabbey. Wits just doesn't seem to matter until the very very late game when other stats are capped out. Even then, you get your crit in much larger groups from so many other places, I generally put it in Con until I have enough to make a difference in crit (10% is about right).
Even with high wits and something like Peace of Mind for a big bonus, a lot of bosses seem protected by plot-initiative where they just get to go first, so it's an even bigger meh.
Factor in a primary stat is worth 5% damage and 1% more crit is effectively 1% more damage (outside of 2h builds) and it's just a disappointing stat. Doesn't ruin the game by any stretch of the imagination, but it's constructive criticism and feedback to provide IMO.