Being results-oriented isn't a solid foundation. 3-color is inherently stronger when you hit your mana, obviously. I've seen plenty of horrible-looking decks do extremely well when they hit their mana on-curve. That doesn't make them solid decks by any means.

While this is true, it's still a fact that I've won with 3 colored decks and never won with 2 colored decks.
This could just be that I absolutely suck at drafting 2 colors, but still.
For me personally, drafting 3 colors seems to be the better decision.