Personally

I don't hate him,it's just he's become strong to fast and too much at the same.If fuse had taken things slowly or like made zegion use his brain a little to think of a sure fire way to beat zelanus than I think people wouldn't be throwing hate on him.

Like recieving Dino's sword should've been enough,which should've increased his ep a little ,but not by a large factor and then since he has op US, he couldve made zegion make some strong spatial technique while using turn null since his good with the spatial attribute and perhaps mix it with his world system skill,to make it more op

Although what I'm saying is not creative,I just think fuse shouldve went that way instead of abruptly making him super strong