yeah two weapon fighting is broke right now.
off hand shouldn't get the extra damage, thats the whole point to the fighting style
off hand bonus action attack should only be an option after making a standard action attack
rogues shouldn't be getting two bonus actions, as it creates way too many balance issues.
Rogues are missing uncanny dodge and expertise among others. Two weapon fighting is poorly implemented as is in 5E and weak with feats. The designers even went on record admitting it should simply be part of the attack action.
