Well to make you happy I could say Shah rukh Khan's role as a special appearance. If in case that role doesn't fit in the script as expected.
But overall, negative could be story not clicking with the audience or to say matching the expectations.
EID is synonymous with Salman Khan now. A huge event film. Casting wise not a problem.
One concern would be the Chinese actors & if Kabir gonna use their language often as our audience won't enjoy subtitles much.
That's the minor thing. Kabir Khan & Salman Khan both know how important to make the film as INDIAN as possible. Infact only Salman & Aamir are the ones (among event films) giving the stories of our heartland. Such huge turn up at theatres as well as TV viewing is coz of that.