For me the flaw in power metal is the vocals. They begin to all sound the same and don't really do much for me from the start. Of course i've always been a fan of death metal, so i love vocals like that. Not that i can't appreciate good singing. I grew up on hair metal, and a lot of those guys had pretty solid voices. Shoot, one of my all time favorite vocalists is Eric Clayton of Saviour Machine. Just seems with PM its like they recorded one vocal track, and all bands use that track on each song. Though if their voice is on a lower range, or has a bit of gruff to it i find it much more enjoyable.