Yeah...see, all of that falls under the category of "opinion". You don't think their lead singer can sing but obviously a lot of people do because they're a highly successful band.
No, they were a marginally successful band. Then people started to realize they were shit, and a group actually sued after Stapp was so drunk he failed to perform a single song at his concert.
Also, just because a lot of people like them doesn't mean they're any good. Masses buy Nickelback and Soulja Boy merchandise. You can't begin to tell me there is any sort of musical quality to their songs.
Can I pick all the ones where they just "sample" a previous hit song?
Sure, the lazy assholes who don't actually make music. Or you can pick the multitude of others, or perhaps the clear majority, that actually make clearly original songs and beats and lyrics. Which Creed nor the majority of shitty rock bands these days have been able to succeed at.
If just having those few characteristics made you Prog Rock, pretty much every 80's Metal Band would be classified as such.
Which would make sense, because there was a resurgence of Prog Rock in the 80's that bled into the 90's and this millennium. It's no coincidence that Coheed and Cambria list bands such as Led Zeppelin, Pink Floyd, The Police, Misfits, Queen, and Thin Lizzy as influences.
Here's a tip: If a bands songs are played on mainstream Rock radio and they sell their T-shirts at the Hot Topic, they're probally not Prog Rock.
1) Can people of all musical inclinations not listen to Coheed and Cambria, or other Prog Rock bands now? Or is it just the angsty teen crowd that shops at Hot Topic?
2) Only a jackass would label a band by where they sell merch. Led Zeppelin T-Shirts are sold at Hot Topic. Are they no longer 70's rock? SOAD has a shirt or two there, are they any less whatever the fuck they are?
Go listen to some early Genesis and get back to me.
Go listen to Coheed and Cambria, look up what a Progressive Rock band actually is, stop listening to fucking Creed, and get back to me.
..See what I did there?