The majority of people who think CoB sucks haven't really even heard CoB. Those people who have heard CoB and won't consider that they are talented either are:
1. A nu-metal follower with the likes of Linkin Park and others.
2. Have no actual knowledge in music and pretty much follows the group.
3. Doesn't really pay attention to what they are listening to. The majority of people will find that this is the best suited reason. You might hear CoB and be like, "Wow, this is slop. It sounds completely out of context." If you open your fucking ears and actually interpret the meaning of the lyrics, the awesome guitar work with the harmonization of the keyboards and the drums, you will actually find that a great amount of talent lies in the band. I didn't mention bass because a lot of people don't really listen for it.
This reminds me of a post I responded to a while back. We were talking about......something, and this dude was like, "Death sucks!" or something of the sort. I got on his case and straight up asked him what he had heard, had he paid attention, etc. He said not really so I suggested a few songs to him. He got them, gave them a listen and after that, he came back to me asking for more recommendations.
That speaks for itself.
