We have lived with the "combat upgrade" for a while now and I do not think the new to-hit and AC calculations are better than the old way.
The dice roll on the screen is meaningless to me now. The more I read about it the less it makes sense. I'm not arguing that some of the smart people who understand the new formula are wrong. In fact, I am sure that they are correct.
My argument is that my to hit bonus plus the roll I see on screen should equal something that I can understand. If it does not, they why bother showing me either number? For the math, I can read them go through the formula that says a +76 and a roll of 10 is a hit and a +86 and a roll of a 2 is a miss. I can indeed follow that. But its stupid! My to-hit + my roll should mean something, but when a 76+10 (86) hits and a 86+2 (88) misses, then the numbers are meaningless.
AC has also lost considerable meaning when you read the numbers. Because it does not directly relate to how effective it is.
I guess the bottom line is that the logarithmic and relativistic formulas are frustrating. Can I figure them out? Yes, but I think it is overly complicated for no apparent reason. On the whole the last series of changes have simply complicated how we understand what our characters can and cannot do to the point that calculators are needed. I consider that bad. it has also simply shifted defense from an exercise in maxing out AC to maxing out dodge and PRR while dumping AC. Has that actually made things better? I this one person's opinion, the answer is no.
Thanks for reading and have a nice day.