Almost nothing from Marvel movies sticks in my mind after seeing them. So pointing to the villain and asking "who even is this?" or asking "what even was the plot?" could be levied against most of them for me.
Let's be real, they have good casting and high budgets, but a lot of the other elements are kind of forgettably schlocky. I realize I'm inviting "ooo edgy" responses, but the way people in general are so high on the marvel cinematic universe, but so hard on Thor 2 is a weird juxtaposition to witness.