Sabaton is disproportionately attacked because it's throng of followers don't accept the fact they have very little variation in their song-writing. They recycle all the damn time.

That said, they're good performers and know how to play... but it becomes so insufferable when literally every release is just a rehash of primo victoria, plus another rehash and then you get a couple of unique songs per album but it really becomes dampened when the rest of the album just don't stick out.

Then when you critique it, there's some big blowback of people who simply can't accept that they may be doing at least even some recycling.

Sabaton is incredibly popular in this subreddit

Now some people just outright hate them and others try to critique their albums and songs. The biggest problem is the folks who come to the defense of Sabaton seem to be in denial as opposed to actually trying to defend them. Even going so far as to claim the likes of Blind Guardian just recycle as well. So perhaps the wrong people stepped in to defend Sabaton and that set off the others?

Who knows, they're disproportionately hated because they're disproportionately loved.