Re: So how did you guys learn the system?
When I'm running teaching games, I start with pregenerated characters, often with a plot centered around the character discovering their newfound superpowers. (Also because I tend to run those at conventions, where player-submitted characters can sometimes be problematic.)
I start telling players what to roll, and then just say what happens. "Ok, you hit with a nine, now roll ten dice. Yeah, that staggers him."
Then I'll tell them what the rolls are. "You're rolling against an 11 to hit. Your offensive value is two better than his defense, so the +2 that gives you means you need to roll under a 13. Yeah, that 12 will tag. Roll your 10 dice. Total that and you have 35, which is your STUN, and the BODY comes out to 9, counting like this..."
Later still, I tell them what power they're using. "You Blast him. That's your 10d6 Energy Blast, on the sheet here."
If they're interested, at the end of the session, I'll go over the powers and and advantages or limitations that did not come up in play.
I find that interspersing system and character build information through actual gameplay avoids overwhelming a new player. It also mimics the reasoning from effect concept, since they see the effect and then the build.