A band is overrated when they don't live up to the hype surrounding them. Which, of course, is entirely subjective. I think the Beach Boys Pet Sounds is one of the most overrated albums in pop/rock history. Does that mean it is? No, it just means I think it is. If I say I think your band is overrated, it's not the same as saying they suck. It just means that "I don't get it, what's the big deal?" People shouldn't take it so personally. As important as it is, it's only music. It's not worth hurting anyone's feelings over.