Long time reader, new poster here. Amidst all the discussion on Marksmanship I'm seeing Glyph of Serpent Sting being cited as a staple glyph for MM these days. I'm one of the exodus of hunters who now is discovering my gear is shifting toward MM being the proper spec for max DPS purposes.
My question is, since each CS is refreshing SpS every time it's used, and its cooldown is much shorter than the duration of a non-glyphed SpS, why is the extra 6 sec duration of Glyphed SpS more useful than say a Chimera Shot, Trueshot Aura, and Kill Shot/Steady Shot glyph combo?
So far, I haven't seen any evidence to suggest that extra 6 second duration is required, especially on a single target Ulduar raid boss. Am I missing something here guys?