I loved that dead turtle fumble LOL! The electrical crit charts made for some great downtime reading.
I've never considered basic math much of number crunching.
The only downside to RM was how long it took to do the combat
There's a correlation there most folks overlook. It's not that the math is basic - it's the number of calculations. Pile on one too many and even the most mathematically inclined are overwhelmed. As with all things it's best for the designer to shoot a bit off from "average" (in this case, erring on the side of simplicity).
Well the 2nd quote is out of context since I was referring to the number of charts you had to look up and unless everyone had a copy of the rules, there was a lot of juggling which is what slowed it down. Not much of an issue now since most everyone has a scanner at home and can just zip off a copy of the most needed charts. It would still take longer than most games but it was part of the fun!
As far as the number of calculations, unless you open ended a roll (...multiple times) you're not doing much.
% roll for attack, add bonuses, subtract def. Pretty standard for any die game.