I mean simple probability disagrees with you but the larger factor is that they dont have as many because they dont care about it that much. I only know of 7 in the past 2 decades and all were independent and appeared to be made in completely different styles unlike DC.Marvel could have dropped 5 great ani flicks 10 years ago, 3 good ones 5 years ago, and 2 meh ones a year ago. People would praise the good ones, but the reality is they never dropped anything noteworthy. I don't see why people are bringing up quantity because that's not the point.
Marvel's ani flicks are just not memorable, plain and simple.