I'm weird because I don't play many CRPGs as opposed to other types of RPGs when I play video games (I tend to be an ARPG junkie), but I've always found that getting probability right as a tool for emulating the tabletop is what makes CRPGs work well.

A lot of modern CRPG-style stuff just doesn't hold up because it goes too far astray from the feeling of risk and chance, which is often just due to technical limitations.

I did play through a lot of Neverwinter Nights 2 recently (ran into technical issues where my save seems not to have flagged quests properly for a while which ended my run), and one thing that I noticed is that when it worked well it really let me just choose to do things and then ran through the rules for me, instead of when it wasn't working well and my character was sitting around taking hits in combat.