My first character was Hugar Hellingstone (you know him) who used a greatsword. I just think that heavy armor + greatswords make the game really really easy. One power attack = dead everything. That's why I enjoy my assassin. Yeah, he can kill things in one hit too, but you have to sneak and be careful in order to land that sneak attack, and if you can't sneak, its a lot more difficult to fight your way out of a situation. Plus you take more damage because of light armor.
I also made a new character to play if I don't feel like doing stuff with my assassin. Her name is Riven and I modeled her off the champion from League of Legends (one-handed, heavy armor, block, enchanting/smithing). I love running with character concepts like that. I think my next one will be a mage of some type...maybe a Necromancer. That would be cool.