Re: Why Mark Ruffalo?
Ruffalo was a better Banner than Norton. To me this isn't open to debate. Maybe I'm being harsh, but I sort of think any justification of Norton's performance is done solely out of bias towards the actors for their work outside of playing Bruce Banner.
In terms of Bruce Banner vs. Bruce Banner, Ruffalo wins.
MCU Rest of Decade prediction:
2015: Avengers: Age of Ultron, Ant-Man
2016: Captain America 3, Doctor Strange
2017: Thor 3, Guardians of the Galaxy 2, Inhumans
2018: Avengers 3, Black Panther, Incredible Hulk 2
2019: Iron Man 4, Doctor Strange 2, Ms. Marvel