Agreed. Makes no sense to play single QB formats.
That's way too much of a blanket statement to make. I like 2QB leagues as much as the next guy, but their practical appeal is tied directly to the league size and draft type.
My neighborhood league has always been 2QB, but it's also always been either 8 or 10 teams. Others will disagree with me, I'm sure, but IMO 10 is the practical upper limit for straight 2QB - and even then I've found that number works best with a 3 QB roster limit, as it eliminates hoarding and doesn't automatically condemn teams to zeroes on bye weeks or due to late scratches.
And if you're going to roll 2QB with 10+ teams, I also firmly believe you need to have at least one (and preferably both) of:
(a) either an auction draft, or
some mechanism for bidding on draft slot (either with real $$$ or out of each team's FAAB, if you play that way), and/or
(b) scaled-back QB scoring (like the example I made on page 1).
Otherwise, you're handing a colossal advantage to those teams who get lucky enough to draw the first 3 positions in the draft - because the gap between A-Rods and Peytons of the world and the guys in the QB10-12 range dwarfs that of their respective RB or WR counterparts.