Offensively it does take a little away from OKC but with Durant and Westbrook leading the way, offense hasn't been the biggest problem most of the time this season so should be ok. Harden and Nate can score alright too.
I don't mind it for Boston. Jeff Green is a bit of a do it all sort of player and will probably be more helpful against Miami and Orlando than Perk really. Even if they let Dwight get 30 points every night, they can shut the rest of the team down and guards those outside players like Ryan Anderson and LeBron when Miami go small etc.