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In comparison to the Glyph of Shadow Word: Pain, the Glyph of Shadow is actually deserving of its spot in the top three. That's only because it's one of two glyphs that translates to a raw DPS increase. Still, as shadow priests progress deeper and deeper into the end game with better and more appropriate gear, its value is getting dulled a bit. Let's take a look at the facts: The Glyph of Shadow is still a "must take" glyph. You simply can't name three other glyphs that would benefit your shadow priest more than this one, regardless of your play style. Do you want to Buy Cheap WOW Gold?
The benefit you get from the Glyph of Shadow is dependent on your spirit and crit ratings. In 3.2, we were stacking both spirit and crit (not because we wanted to, really, but because it was forced on us in our tier), making this glyph especially valuable. WOW Patch 3.3 saw better itemization for shadow priests, including a slew of gear that contains haste and crit rather than spirit. And, as shadow priests see less and less spirit in our builds, the bonus from the glyph gets less impressive. (Interestingly enough, the dependence on spirit makes this glyph a strong one for main spec healers who moonlight as shadow priests.)
The glyph works better for end game play than it does for leveling. You can add this glyph to your build at level 20, but it won't be of use to you until much later. The simple fact is that, in the early levels, you don't have a lot of crit and you're not casting shadow spells exclusively. Low level priests aren't especially likely to see this buff trigger. Final verdict: Make this glyph a part of your build if it's not there already its biggest strength is that it's useful no matter what you're doing with your shadow priest. It's decent for leveling (at least, in the later levels), decent for PVP, decent for soloing, a must have for five-man instances, and must-have for raiding. It's especially strong for people who play shadow as off spec.
