I liked the random chance. It was one of the few things I preferred about 3. Well, really what i liked was not knowing if the check would be successful or not. Even if they hid whether it would work or not, or at the very least didn't tell me what skill level I needed, I would have been happy with that.
I think it comes from RPing with paper and dice. It doesn't seem right if you can just autowin, a higher skill should just be a higher chance it works. PErsonally I think there should be a way you critically fail where you make things worse too (but the rewards for using a skill check vs. regular dialogue better as well). I suppose though when RPing with paper and dice you really can't just go back and do it over again (which I admit I did in 3 a lot. I'd say I'd try to play without doing that this time but I know myself way too well. If nothing else I get curious what the other results are <-did this in Wasteland 2 yesterday trying to fail a check to see what happened. And then I just can't get myself to not keep the best result).