I agree that one on one most monsters are relatively easy (since, as with all games, patterns can be noticed then taken advantage of - this is not a TES issue but a gaming in general one).
However when you find multiple (moreso with enemy casters - hehe if players had half their power you'd never see a complaint about mage power

) thats when the fun starts. Fighting 3-4+ can be really fun.
If you really find no challenge in master without the abuse of the crafting synergy or one of the many, many abusive mechanics then sadly it's time to reroll and try roleplaying. Though without 'self gimping' (love that term, especially in a role play game) it stands to reason you will not find challenge in this game.
*sigh* Not this again. Being overpowered to the point of breaking the game should NEVER be a choice, because if someone for some reason (roleplaying reasons maybe) wants to take blacksmithing and enchanting, they are screwed (they lose the choice to play as they like).
I'd love to see how they could roleplay the crafting abuse. Smithing and Enchanting alone are not broken, hell even together they are't that bad, it's the multiple stages.
People create something, that they then use to create something, to cre...... to create some armour. Roleplaying? An OCD Blacksmith who specialises in enchanting and loves making potions as a side hobby?