a fan of heinous
This terrific post by Rands in Repose justifies why it's OK to adopt new criteria for fixing bugs the closer you get to ship. In actuality, the scale goes from a straight ramp (low, med, hi) to completely polarized (whatever, whatever, heinous). It's not that you're lowering your standards, it's that you're recategorizing away from the straight line of mid-project bug triage.