Obviously you haven't listened to the album, or looked at the reviews both Hit the Lights album got. This album/band is way more versatile and like someone else said, 'dynamic'. But, I am not going against your personal judgment,
Think about it, Some of the biggest bands (Blink 182, New Found Glory, Saves the Day) have somewhat not so talented vocals, but that never stopped anyone from loving them, nor did it stop their extreme success. Some bands these days can't even live up to their vocals at a live show compared to their recordings (ex: Saosin, Fall Out Boy, Taking Back Sunday, Panic at the Disco).
I think this band is far better live than on CD, and they know how to put on one hell of a show. All in all, this album is great for fans of Nirvana/Smashing Pumpkins, all the way to The Used/The Starting Line. Like Tait said, everyone should give it a chance.