I do not know if that´s what you meant but in D20 systems you always have a 5% chance of a critical fail and a 5% chance of a critical success, no matter what is your proficiency, stat or ability/saving throw/ attack/spell attack expertise. The chances of getting a success or a failure in any check improves if you have a very high number of a particular attribute, skill etc in comparison with the difficulty of the thing you want to surpass, and in the same manner, even if you have abysmal scores in a particular action you want to make, there´s always a possibility that you can achieve it.
There are people that like it , there are people that don´t , but since this game is supervised by WOTC and the D20 is kind of the core of D&D I assume this is what´s the game is going to use yes or yes.
In my experience with D&D the % to hit or fail a saving throw oscilates to a great extent because it depends in several factors and the stats of the creatures and player characters change a lot. Being a videogame, they can change the odds to favor the player or the monsters, of course... dunno if it´s going to be made in the game. I hope not.
