The close-minded way people view legendaries is really irritating to me. These days all everyone cares about are the meta game of competitive battling, so that's how they look at the Pokemon: super-strong ones at the end of the 'Dex are legendary, and nothing else.
There's obviously different types of "legendary", which apparently the Japanese version acknowledges ("Mirage Pokemon", "Pokemon of legend", and "Pokemon of myth"). But you can probably tell I'm teasing this guy, with the worship of Slowpoke. haha