Now that we know the details of the Iran war MOU, almost all the commentary I've read thinks no deal would have been preferable to this deal. I'm willing to let the 60 days play out before declaring it a total disaster.
It doesn't look like our negotiating accomplished anything beyond what our bombing did. I am disappointed with this outcome so far, with a final assessment to come later.
I fear we'll conclude Donald Trump is a Master Negotiator primarily in his own mind. I'd love to be proven wrong.