In my build I'm avoiding sneak based on feedback from friends who've played so far. They've told me the game gets too easy with sneak at level 100. We all know the stats, with the items and spells that make sneak even more powerful, and the youtube videos demonstrating this, but I wanted to know if you're playing your character with sneak at a low levels on purpose.
Also,
Do the higher game levels suppress levels for sneak, or are the enemies just harder?
Seems to me that active "role-playing" in Skyrim is needed. Meaning, you may need to set your own parameters in terms of character growth to get the most out of the experience.
Thoughts?
JS
This is an open RPG, sandbox, meaning YOU have to set your parameters and limitations to the char you want to play.
Answering your question. Overpowered? No it's not, in my opinion.
Right now I play a sneaky archer. The "sneaky" word means basically that has an ability that many others don't have, so it can hide and cast surprise attacks that other fighters can't. I don't expect a sneak skill to have little power, or else THIS char wouldn't be fun at all.
Less challenge on fights? Maybe. But my challenge here is that I can't receive as many hits with my light armor, as a heavy armored melee warrior. I also can't cast healing spells because I don't have magic, neither craft me uber weapons or armour because I don't have smithing nor enchanting.
I will, anyway, play a heavy armored warrior some day, with one handed sword and shield. But I won't use the sneaking skill, nor lockpicking, simply because it doesn't fit on the char I have planned.
You have to create the challenge, and I don't think there are any "overpowered" skills. Of course if you create a character with alchemy, lockpicking, smithing, enchanting, one handed, heavy armor, archery, sneaking, destruction, restoration.... then yes... it's "unbalanced".... The char... Not the game.
You mention "your build", but don't specify what class, or character type, you chose. If you're with a thief-like, rogue or assassin, then I would say: go for sneaking. If you want to play a mage or a warrior... then think about what profile you want for it and if it makes any sense for the char to "know" how to sneak. A non-light armour warrior shouldn't, in my opinion. If you choose not to, then simply don't use sneaking. Maybe for RP purposes use it ONLY at pitch black places, next to a wall, but ignoring the perk-tree, meaning you don't take advantages at all about critical bonus, etc...
Good luck and have fun.