I disagree. Depth is good for the knees. Going deep makes the hips the primary load-bearing structure wiht the knees being secondary. Also, going deep causes the hamstrings to act as stabilizers aginst the patellar tendon.
However, if you're performing PL-style squats (which I doubt as you say you're bulking) parallel is fine as the ultra wide stance causes the hips to be the prime load bearers.
Here is a great link that goes in to more detail:
http://www.elitefitness.com/forum/showthread.php?t=332299