The sum is greater than it's parts.
Marvel studios did not get this far by giving directors unlimited amounts of creative freedom. They have their vision and continuity that got them to here in the first place. They gave Wright a un-marvelish amount of freedom so far. Beyond that it still seems weird to me that we go GotG > AoU > Ant-Man instead of the other way around. Seems to me that Marvel has been very compliant with Wright. Furthermore things like things like Scott Lang being the main protagonist seems off for Marvel studios like it would be off to start with [spoilered for people who don't read Captain America]
. There is just a too big of an industry behind it all to deviate so much for the initial vision that it doesn't surprise me Wright was let go. The Marvel Studios movies have never been about the director but about fitting in the continuity. They simply can't afford to start giving directors unlimited amounts of freedom, and thats fine if that is the the strategy that got them here.