Negativity around him -
That had zero effect on the box office. It was evident at the response Maine Pyaar Kyun Kiya got amidst the protests.
Ahead of it's time -
Jagga Jasoos released last year. Bombed. The ahead of it's time is an ordinary excuse. Jaan-E-Mann was out & out musical. The target audience of Salman or Akshay & even Bollywood aren't open to such narrative style. And most of the lyrics were plain dialogues being sung.
Clah with Don -
Definitely. That was more flashy in the competition. Jaan-E-Mann wom didn't click in big. Don went down soon but when both the films matched each other collections, it was in the lower side & Don had won the battle with big initial. This big clash crashed sooner too. Sadly Jaan-E-Mann did perform overseas but couldn't manage the HIT business Salaam-E-Ishq did in Jan/Feb 2007.
And regarding heavy promotion. Both the films had heavy promotions. It's not NGF backed anything down. They had to stop releasing the success posters after 1 week.