My character is an assassin, level 39 at the moment with maxed out pickpocketing (stealing weapons and their armor from NPCs are amazing) and nearly maxed out sneak. It's exhilarating and extremely satisfying to sneak up on an enemy and slit his throat with an enchanted dagger for 15 times additional damage (perks)...
That said, as an assassin I do have trouble killing dragons at times. Your sneak abilities are useless against dragons so you have to rely heavily on terrain to dodge ice/fire blasts. Even then, your one handed weapons do mediocre damage to dragons too until you reach the juicy perks in the one-handed skill perk tree.
From time to time, enemy NPCs wonder around in packs so it's difficult to ambush them. But I discovered that you can actually shoot an arrow into a corner and their attention will be diverted to that particular corner, allowing you to sneak up on them and possibly take down one or two before the entire pack detects you.
My only major gripe with this game would be the shadow textures. For some reason, at certain angles the shadow textures are AWFUL for me. I run a GTX 560 TI with latest video drivers, so I highly doubt it's my video card. I hope a patch or a mod will fix this soon :S
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