Late to the party, but I just want to say OKC definitely did the smart thing and their haul is actually really good. Lamb will be a better 3 and d player than Sefalosha sooner than later and Martin will probably average like 16 ppg off the bench provided he stays healthy. And then there's the draft picks.
I like Harden and everything but he's not a #1 guy and definitely not worth max money. As pretty much the only scoring option on that rockets team I predict by January we'll see lots of "Harden should have just taken OKC's first offer" posts.