Originally Posted by
shadowboy
Bleeds ignore armor, so you should not count rupture in your list of abilties that benefit from sunder.
General comment: Keep in mind also that executes are often important and in those situations, assassination benefits pretty significantly from sunder, as dispatch is mitigated by armor.
Regardless, it will nearly always be a raid dps gain to sunder since all tanks and nearly all pets also benefit from it.
In comment to heavy target switching fights: If the target switching is heavy enough to necessitate redirect glyph, you may not (depending on the fight) get the most out of the vendetta glyph, so you may be able to use the EA glyph in the vendetta spot. If you lose more than 6 seconds of vendetta time with the glyph, the glyph is a loss (and that's strictly from a time-averaging sense, if shadow blades is used with vendetta, it reduces the value of the glyph with lost uptime).