I think that pretty much every giant relies on their size way too much. Their size is very helpful when fighting people high RA level or lower, but when people reach at least low VA level, their size doesnt matter that much so they get beaten pretty easily. When Oars.Jr fought the Giant Squad, they got neg diffed because they always rely on their size, didnt spend any time becoming good with a weapon, and when someone bigger than them showed up they were helpless. The only giant so far that might be a good fighter regardless of his size is John Giant.