Personally I think this is a line that needed to be crossed. These kinds of positions are important to running our country, and appointing people to these positions are a presidential power. The GOP (and the Democrats before them, under Bush) has been blocking these appointments in a blanket manner. It's not about any objection to a specific candidate, they're doing this to hamstring Obama. They have a vested interest in him failing, and they'd rather hurt the country as long as he's in power.
Furthermore, temporary appointments during recesses are an express presidential power, and Congress has taken to exploiting a loophole to try and block this ability. They made fake sessions. No actual business was conducted, it literally lasted five seconds just so they could claim to be in session. It's a blatant effort to circumvent an express constitutional power. It was unacceptable when Harry Reid did it, and it's unacceptable now.
This country needs to settle the question about exactly how much leeway Congress should have to be obstructionist regarding these positions. Take the labor board position that kicked off a lot of this: this is an important position. If the appointment was unconstitutional, that means all these decisions made come under question. The result of that? Taxpayers funding the millions of dollars in legal fees that will likely result from challenges to the board's decisions, and an eventual appointment probably re-making all of the same decisions. For what, exactly?