Casual Shinji said:
That's cause the MCU fanbase isn't as old and cancerous yet as Star Wars' -- They're still riding that fresh excitement train.
Oh, I don't think that's it - the MCU is ten years old, that's enough for people to grow up from kids into teens, and teens into adults.
No, the reason the MCU fanbase isn't cantankerous is, well, what is there to get upset about? As in, almost every MCU film more or less follows the same formula, with the same tone, and the...well, same everything. It's popcorn. You can get sick of eating popcorn, but if you know you're going to get popcorn, you can't get angry about it, in the knowledge that popcorn is all you're ever going to get. The only time I remember any sort of controversy in the MCU is Iron Man 3 over the Mandarin. IM3 is actually one of my favorite MCU films, but apparently most of the fanbase hate it because the film didn't deliver what they wanted. Compare that to later MCU films like Thor: Ragnarok. Yes, it's different from the previous Thor films, but it's different only by virtue of aping the tone of Guardians/Avengers.
Now, Star Wars is arguably popcorn as well, but it's popcorn that has been willing to try different flavours. Compare the OT to the PT. Consider Last Jedi. Consider how immediately after Last Jedi how we go to Solo, which is a completely different film. The MCU doesn't do that. It's happy to be safe, because being safe means being uncontroversial. Being uncontroversial keeps the fans happy and more importantly, the money flowing.