+1 to not having critical failures/success.
It's weird that Larian has implemented it as such right now - because they are the first ones to talk about limiting RNGs (which was what lead to all those special advantages in the first place). So I'm not sure why they're putting this in here. For the majority of players it just leads to more save scumming and frustration (people are naturally not great at statistics and notice natural 1s way more).
It is a somewhat common house rule though - so I'd say the ideal solution is to have it off by default, and add in a optional "critical 20/1"s for those who really want it.
