I have a lvl 15 character who is an assassin type build. I have the 15x dmg backstab perk and with my dark brotherhood armor I have double backstab dmg so I have 30x damage when I backstab which pretty much takes everything out with one hit. Is it me or does that seem a little unfair?

Don't like it? Don't use it.

:facepalm:

Nah its unfair when you are a two handed monstrosity that does like 600+ damage per swing without power attacks because you leveled and perked the three crafting systems and used them to buff eachother for your ascent to near god hood.

If there's no challenge then raise the difficulty to master (if you didn't) and limit yourself.