Why fight everything along the way when you can just sneak past it and get to where you need to be quickly?
Also handy for grabbing the loot out of the chest behind the back of whatever happens to be guarding it.
Can't argue with those points!
My main is a shadow tank. Lately, I've been playing a smuggler, sage, and doing some partner-only characters that are imperial. I'm finding that I prefer ranged combat over melee, but I faithfully return to the shadow to run various dailies. I still need to do Makeb, but haven't found the motivation to get there yet!