Are you insinuating that the movie going audience doesn't enjoy the continuity of these films and the fact that they are connected?
How can you even imply something like that when these movies have been a massive success?
I think you're speaking from what YOU want and not what... has been working.
I reckon it has something to do with Age Of Ultron. I think Hank Pym IS the one who creates Ultron (not Stark as many have guessed) and Marvel probably want to shoehorn the backstory of Pym and Ultron into Ant-man. All you need for a villain in a film is to see the origin and motivation, both things that don't require a full film beforehand to set up Pym as a character. As Edgar Wright has had his Ant-man plan for a long time I'm guessing he wouldn't of been planning to mix with other Marvel scripts for his film.
I'm probably completely wrong but it makes sense
The MCU is able to get away with this because it hasn't produced a genuinely terrible movie like a Spider-Man 3 or an X-Men: The Last Stand yet. Plus, the highs have been high enough to excuse the lows. Iron Man and the Avengers were massive and resulted in enough goodwill to excuse the fact that Thor, Cap, and IM2 made a lot of sacrifices to build up the Avengers. Also, the only thing that prevented Thor 2 from being completely forgettable was Tom Hiddleston's Loki carrying that Avengers momentum with him into a bunch of scenes that were added at the last minute for that exact purpose. Age of Ultron looks like the point where the MCU hits "middle age". After that, a lot of the franchise staples like RDJ and Chris Evans might not be around any more and we have to hope that the likes of Quicksilver, Bucky-Cap, and Doctor Strange/Ms. Marvel/Black Panther/Ant-Man can carry the torch.
Russia is cold, why can't Batman have a warm hat?
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I meant by letting them work their creative touches into the MCU though, not just success alone. If that was the case, then Marvel would do everything in their power to hold onto a surefire choose like Wright. If they really had any creative differences, then why did it only come out now after backing him for so long?
This is a hugely odd move, one might assume it would be Marvel wanting something more serious than the comical heist idea Wright wanted, yet they're letting Guardians appear to be quite humourous in tone, at least with the protrayal of Star Lord. One wonders how this is liable to affect the various cast members and such. I still would love to see Eric O'Grady as an ex SHIELD agent so they pay homage to all three Ant Men in a way.