I play all, but all of my chars are some way stealth-related
So you can have stealth/??? characters too.
May be the best way to go if you want to "respect" the game
to be honest, I played the dark brotherhood AND the thief guild quests and they were really repetitive.
I was just one quest short of completing the thief guild and I completed the dark brotherhood.
Every single brotherhood quest is near exactly the same.
I don't really see what's so special.