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Some are good and some are bad, same as megas. I think while the bad megas were overly edgy and detailed though, the bad gigantamaxes are too goofy and cartoony, so it depends on what you like (or dislike) more.
Unfortunately half of the Galarmon gigantamaxes should probably be the third evo/final stage of a line. There are a few mega evolutions kind of like that too (Sableye, Mawile) but a lot less proportionally. It's going to suck when the gimmick's inevitably cut.
