Tbf I think Iger did a decent job. Obviously the shareholders would say that he did. He didn't have the creative side that Eisner had nor the almost insane ambition. His biggest accomplishments were buying other IP, which served Disney extremely well, getting a theme park built who's long term future has to be in doubt with US-China relations being what they are now, and somewhat fixing the Parks messes that the late Eisner-era introduced around the globe, with the domestic parks lagging in investment until the end of his tenure. Although biggest of all will likely be Disney+, which he somehow got ahead of the curve on and has been a wild success, even if everything about streaming has a somewhat uncertain future.
But yes, I think Eisner was more impactful and Iger really just followed up on strengthening the company that Eisner created without the wild and ambitious creative swings in parks that Eisner did over and over again. Iger's biggest strength was pretty clearly easy to deal with personal style that got a lot of acquisitions done and being willing to spend money on those things.