Current tier of trinkets is one of the most interesting - you need to adapt your personal playstyle sometimes. To make the biggest use out of Talisman, you surely need a Haste build. Not sure about Enh Shamans, but I think with Flurry and such they have even higher Attack per Second then hunters, so this trinket can be potentially very usefull.
I get 5 stacks numerous times a fight on my combat rogue and according to elitist jerks combat guide it is currently BIS for combat. Yes mut pulls more, but blizzard has decided to not give me a single dagger this tier so I make due with what I get.
Its probably because I have a crazy fast auto-attack though and on top of that am SS'ing or RvS'ing every GCD. A GCD that is shortened by adrenaline rush and my 4 set piece.
The generalist looks outward; he looks for living principles, knowing full well that such principles change, that they develop. It is to the characteristics of change itself that the mentat-generalist must look. There can be no permanent catalogue of such change, no handbook or manual. You must look at it with as few preconceptions as possible, asking yourself, "Now what is this thing doing?"-Children of Dune