1) I find it ridiculous that someone would actually ask other people if their music taste is good or not. It's one thing to ask for suggestions, it's another thing to say "Are the bands I like good?" And please forgive me if I misunderstood the idea of the thread.
2) I find it even more ridiculous that people who are into metal are afraid of admitting they like someone who's not metal, or pop, or hip hop, or whatever. If you really think you're better than everybody else because you only listen to metal, or prog metal or death metal, guess what? You're a tool. You're a big friggin' idiot (and I don't think anyone in this thread has said that, for the record). The whole "It's Metal or No Music" attitude is so pathetic, it makes me wanna laugh at those who truly feel that way. You should like whatever sounds good to you, and if people think it's ridiculous, guess what?? Screw them. Big time.
Now, if you want some more mainstream music suggestions, I can try to get a few more recommendations your way. And as far as your list goes, I think I like quite a few of those, especially Heaven Below and (mentioned later) Alter Bridge.