I've been watching the reported percentages. I took statistics in college, and have played tabletop RPGs with dice long enough that I understand that sometimes, you roll more 1s on that d20 than you'd expect. However, I also know that over a large sample, statistics should average out. Over a hundred items, if you have a 20% success rate, you should get 20 (plus or minus 2, say) items that you've hit that 20 percent on.

That's not what I'm seeing. There seem to be variables which are unreported, or the game has a really bad random number generator. Basically, if I have less than an 80% chance of success, I have about a 50% rate of actual success.

I'd prefer if the number shown reflected all variables, and actually bore some resemblance to the success rate.