It's a good deal for the whole world except for Saudi Arabia's regime, Israeli's hardliners, American Hawks and Iranian hardliners.

For stability of the region, commerce, peace and moderate forces in all parties, it was a good deal.

It wouldn't have resolved all the issues the world has with Iran, but the idea of having a "deal" in place that resolves all issues is childish.

Eg can the US have a "deal" with Saudi in place to resolve all the regional and human rights issues with them? Of course not. But those who argue against the JCPOA claim the US could've had a "deal" with Iran that resolved all issues.

It would've been used to rebuild some trust between both nations and help resolving other issues in long term.