He is a "moron" (and a troll, IMO) because his argument was not that Marvel would continue to make superior films, but rather Superman, Batman, Wonder Woman, The Flash, and Green Lantern are all unpopular characters. Considering they are among the most popular superheroes ever, that's an insane statement.
Secondly his use of the English language is amazingly poor, which means (unless English isn't his first language), he is uneducated, which could also be termed, as The Batman said, a moron...though I wouldn't be quite as crass in the wording.