Do you mean morally good or bad? I don't believe that it's either.
There are individual artists and songs are OK and individual artists and songs that are not.
For instance, I refuse to listen to Carman, as a rule, because he considers William Branham a "hero of the faith" and even went so far as to write a song praising him. In addition, he is a part of the WoF cult and this often finds it's way into his music.
There are some songs of his which I would have no problem with with, such as "Revive Us, Oh Lord" or his versions of classic hymns. On the other hand, I have some serious problems with his songs such as the afforementioned William Branham song, "The Third Heaven" and "Satan, Bite the Dust".
Phillips, Craig and Dean is another interesting example. They're Oneness Pentacostals who deny the Trinity but they have some wonderful songs that don't reflect their flawed theology.
The vast majority of CCM artists are doctrinally sound and hold to orthodoxy but there are some out there who don't so it's up to you to know what you're listening to and to be able to discern between the good and the bad.
Now, if you mean is it artistically good or bad, then 90% of it should be flushed.