Thanks to everyone who voted. I'd say the consensus is close match-up, with B the slight favorite.
So first, the background: I'm Team B. Yahoo lists Team A as a fairly substantial favorite (it was initially 13 points, with a ~65% win probability, though it's since been revised down a little). That just seemed way off to me, and I was curious to hear other's impressions.
Now you're probably asking, "Who cares? None of this matters." And of course, that's true. Projections are meaningless. But while it's certainly easy to rag on their pseudo-precision (Yahoo extends projections out to two decimal places, as if that matters), I would say that they're probably fairly accurate in a broadly directional way. That is, I bet if you ran the numbers, the team that's projected to win does in fact win more than 50% of the time. This is the first time they've ever seemed way off to me. (And by the way, an obvious reason why I'm such an underdog this week is because I had to replace Wentz with Foles, but my guess is that even with Wentz, I would still have been a slight underdog, which seems crazy given the rest of the lineups.)
The other thing that's kind of interesting is that, as easy as it is to dismiss projections, I can't be the only one who hesitates an extra moment before subbing in a player with a lower projection, or who does an internal fist pump when my projections get revised upward. I think the pseudo-precision actually makes it seem more legit, even though we know deep down they're just a collection of educated guesses.
Side note: even though Team A's line-up doesn't scare me all that much, he lost (to me) in Week 1 and has since gone on a 14-game winning streak, locking up the No. 1 seed despite having only the 5th highest point total in the league (his points-against are more than 100 points lower than any other team). So maybe Yahoo does in fact know something that I don't.