I don't think it's really because of the gimmick, but because he's actually a decent big man.
It could also be contributed, at least partially, to nostalgia. I know what I'm about to say doesn't make sense, but even with all the inconsistencies, the base character stayed fairly consistant since his debut. He's a monster and always has been, and the monster gimmick is one of the more popular gimmicks. The fact that Kane can deliever decent matches and great brawls only adds to it.
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