Graviton is definitely an incredible fighter and was able to take on the Avengers! He pwned guys like Hulk and Thor! That in itself is an impressive feat. None will forget Graviton after an impressive show like that. Graviton may not be that popullar, but he’s easily the most deadly villain the Avengers have ever faced. With his gravity powers he’s easily the strongest being in all of media.
His Main Forms
His Record
W Daken
W Nick Fury
L Broly
W Thanos
DReager1.com 
He is an enemy to be respected. That being said, Thor could take him down in time.
Yeah, in Thor’s stronger forms he could probably take Graviton down. That being said, in the end it all comes down to whether or not Thor can break through his gravity. In the show only Hulk was able to break through temporarily, but then he was taken down pretty fast. In the show Graviton was pretty much unstoppable. Of course Thor has the Odin Force in the comics which greatly enhances his power. That would be a tough fight to be sure!