When Israel's prime minister Netanyahu called Iran's Nuclear deal with western powers a historical mistake, and when U.S., EU, Iran, UAE and others called it a historical success, both would be correct in that the deal is unprecedented and historical.
The way this deal came to fruition is a marker of our new multi-polar international order, and it translated effectively the U.S.'s transitional position from hegemony.
The transition to a multi-polar system allows disgruntled states, such as Iran, the political opportunity to assert their rights. Iran has been calling its right to have peaceful nuclear capability, according to international law and the NPT convention, as its "Haq". Iran has achieved that Haq, and the international community legitimized Iran's nuclear program. Far from Iran becoming a U.S. partner or ally, this deal paved the way for much needed cooperation between the U.S. and Iran on crucial regional files, such as Syria, Lebanon, Iraq, Afghanistan and Yemen. In the larger context, expanding U.S.'s partnerships in the region against terrorism, the strategic priority, is of mutual interest to both U.S. and its allies and Iran and its allies.
This deal also signified the success of negotiation, and finding grounds for mutual interests, preceded by accepting the opponent as an equal... A far cry from the archaic and failed carrot and stick mentality.
The nuclear deal signifies the possibility of the long sought after Political Independence in the region. Ever since Pakistan's Zulfikar Ali Bhutto declared in 1978 that the Islamic civilization will also possess nuclear arsenal, in order to not be subject to blackmail, the underlying current to strive for greater political independence and attaining regional power is getting stronger in the Middle East. Iran proved that resisting the subordination of policy to U.S. and western interests is possible. Egypt under al Sissi is taking note and so is Iraq.
Autonomous policy making and resisting subordination to the west does not translate to becoming an enemy of the U.S. and the west, quiet to the contrary. It is a blunt political stance that implies the need to being treated as an equal, and recognized as having legitimate national interests. For these states coordination and cooperation are the preferred courses of action with great powers. Because only through cooperation and coordination with great powers can these states recognize and legitimize their statues as equals. From a strategic stance; accounting for the U.S.'s proactive management of the historic transition to a multi-polar system, this initial/6 month Nuclear deal qualifies for a win/win statues.