I just want to point out that even though it has S-300 and Klub and all that stuff you think is cool this ship would still get totally owned by almost any USN warship currently in service.
On the contrary, she'd be very handy against most individual USN warships in many scenarios. The strike helicopters for one thing. She'd fall down against the US Navy as a whole though. And there would likely be only one of her type.
She's a flagship, a soft-power ship. Used like the Kirov class is being used for now, what countries can have when they can't afford aircraft carriers. Turns up at international regattas to show the flag. Has multiple other uses in low-level conflict situations; this one is better than the Kirov for that. If I were Iran I'd seriously consider building this. Similar to their space program - gain national prestige from launching monkeys into space. So what if its not a Soyuz or mars rover, its still impressive.