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I think the major difference is that most were excited for and supportive of new superhero/fantasyWhat's interesting to me is that - for the general public, not avid comic readers - the rise of the MCU happened with some relatively obscure characters. Iron Man was not who I would've thought would lead the charge - followed by Thor.
I think they got very lucky with casting (or just did a great job casting) and those early movies were just fun as hell and still a solid mix of practical effects and CGI instead of All CGI All the Time.
It's OK to feature a D list character as long as you cast well and tell a good story (duh, I guess).
now we have an entrenched faction that is anti franchise fantasy regardless of output
I'm not sure if it started as a strictly Disney blowback and then morphed but people's feelings about Disney seem inextricably linked to feelings about Disney whether or not it's actually from Disney