I think what he was suggesting was that Megatron's role in this film was minor. The real villain in the film was Quintessa, and it felt like Megatron was only there because Michael Bay was obligated to have him show up - So Hasbro can sell Megatron toys!! They could have left Megatron out of the film entirely, and say he spent the whole event in a basement trolling on 4chan (and probably cyber-stalking Sam Witwicky), and it wouldn't have made much difference to the plot.
Having read a lot of Marvel/DC comics in my life, I've noticed that at least 1 of 3 things eventually happen to the villains:
1) They die.
2) They get reformed and turn into an anti-hero.
3) They get reduced down to being a comedy-relief character and training dummy for the main hero.
I think movie Megatron is headed towards the 3rd direction.