While I mostly take the side of those who believe that the recess appointments were legitimate because the Senate was in fact in recess, I agree with the letter sent by Senate Republicans to the White House asking for more detail about the logic in making the appointments. I haven't seen any WH response yet, but I do think that it's appropriate to release any Justice Department or White House authored legal opinion, assuming there is one (and if there isn't, we should get to know that too).
I understand that for political reasons the administration wants to focus on the substance of consumer financial regulation. But procedure matters, and we're going to need something more than just Dan Pfeiffer saying that "Legal experts agree."
Meanwhile, a couple of things you might want to read: Nolan McCarty over at the Monkey Cage knows about the older history of recess appointments, and a second post by Matt Glassman is interesting, too.