Would a thief that uses a 2hander be viable?

??

I havent experimented with it yet, but be aware that in Oblivion, you didn't get sneak attack damage with 2-handed weapons.

you can uses whatever you want but two handed dont get sneak bonus.

dagger and bow thiefs / assasins / rogues will be at a better advatage

Not with 2H, only x2 sneak attack bonus.

I think losing the sneak bonus is too high a price to pay. It's too bad, I like the idea of a two hander using sneak build. Maybe if they let Backstab work for 2 handers but at a lower multiplier (x4 instead of x6?). Modders?