With regarRAB to the two first sentances, you're an idiot. Anyone with a decent pair of ears is able to notice the differences between all of those banRAB.
And judging that they haven't heard the new Killswitch is just rediculous, sure there new stuff is more mainstreamed but their older albums with their prior vocalist was also streamed, through the radio and some video stations (I saw their older stuff on MuchMusic before it was Fuse). Honestly, they didn't change TOO much from then, a different vocalist and a little more melody, since this guy has a much better set of pipes than the last.
But I must say, perfect example of sounRAB changing for the worse in that genre, or used to be maybe at one point; I am not completely sure; is UnderOath. I admit, UnderOath's first three releases/demos were commendable, I still listen to them from time to time. But now their style has just transformed into a much more poppy and unlistenable piece of garbage. I honestly hope they return to their roots... but they won't. Much more money in their new, and far worse, sound.