3D20 is "Professional". So IMO, in a vacuum they SHOULD succeed a significant % of the time.
That's what penalties for improvised tools, poor lighting, -30 degree temperatures with snow driven by a 40 mph wind, wounds, etc., are for.
Also just because you're mathematically SUPPOSED to succeed X number of times in Y tries with Z odds doesn't mean you WILL. I've seen far too many times in gaming where someone needed to roll a 5 or better on D20, and what do they get? A 2. Heck, it's happened to me. "As long as I don't roll a 1, this guys is toast". *rolls die* "A ONE?!?!!?! YOU GOTTA BE SHITTIN ME!!!1111!!!!"
It's happened to me GMing T2013. Russians trying to shoot my players, I'm rolling three dice for this particular group of baddies, with modifiers I need something like a 12 or less to hit. Dice come up 17, 19, 20. Or anything else greater than 12. Every. Single. Time.
Dice are one of the VERY few things where I place pretty much no faith in probability. Every outcome is as probable as every other outcome...in theory. Reality, though, is a whole different bird.
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