No using two mic's out of phase will not sound good it will sound thin as the wave peaks cancel each other out.  It's not that you want this it's just a matter of physics that it will happen so you will need to flip the phase on one of the mic's. The example being a top and bottom mic's on a snare, one to capture the attack, the other to capture the snare buzz.  So one is pointing down toward the snare the other from underneath pointing up so they will be out of phase, so you need to flip the phase on the bottom mic.  This can either be done while recording or in post production.