Well..not real descriptive OP, but I get the point. Three Days Grace make pretty deep music. It can make you sad, or even angry quite easily. The vocals, guitar riffs, and whatever that weird noise is at the intro of It's All Over make One-X a pretty miserable album in terms of the spirit of whoever composed it. Of course, nobody takes any of this seriously.
There is a lot of repetitive lyrics, and I mean a lot. they rarely ever vary throughout the whole song, except maybe Pain and Never Too Late. Maybe that's why there is so much hype over those two.
All in all, this alt-rock quartet has a pretty nice influence over anybody who has had their fortune to fall under the swoon of sad-angry loud thrashing.