I adore Skillet, though mostly the newer stuff. Favourites are Rise, Awake and Alive, Hero, Circus for a Psycho and Monster. Those are some of the heavier songs. They do a lot of gentler stuff that I really don't go for.
I'd recommend against reading the comments. Skillet has one of 'those' fan bases, unfortunately. It's especially bad in any Rise videos. That song seems to drag the f**kheads out of the woodwork to wave around their victim complex and invite all kinds of ill advised activity.