As a sneak archer, which I love, he can kill big dudes in 3-4 shots.
What killed you is you put too much time into enchanting, alchemy and smithing early on. Play the game naturally. Of course you are going to be pulled apart if you have low armor rating. I've played that build, and in my experience you are so busy killing things from a distance that your armor skills don't increase at the same rate as they should.
Everyone is quick to blame the crafting skills. And although this can be an issue I don't know if it the main problem here as the OP doesn't seem to be that far along in these skills. Your point on AR is probably a greater factor in his defeat. 60 enchanting, 33 smithing, 48 alchemy doesn't seem like he abused the crafting skills. At level 36 how much more naturally can you level them. Might be a bit of grinding, but not like he was at 100 in all three at level 20 or something.

