Sneak shots will 1 shot any normal npc/mob and for miniboss npcs, I can take out 3/4 of their health before they even reach me.. Giants you say? I two shot them. On top of that, archers only need to take HP as you level up so you end up with a ridiculous amount of HP to the point that you can easily tank any guys that reach you. And I almost never use pots.. I have an entire stock pile of them that I have found from exploring. For rangers/mages, just strafe back and forth and you never get hit. For melee, just snipe them first. If you have high enough sneak, you can take out a room of 6-7 before they can even find you. The only monsters that have ever given me a run for my money are higher tier dragons.
Just my 2-cents.