Re: bama's comment about what rock is based on and how Christian rock is hypocritical to that:
No; rock is also based largely on traditional black gospel (see quote from Lou Rawls in a different thread about difference between gospel and blues being the words). There's also a lot of joy, exuberance, power, confidence, simplicity and accessibility (which can be a good thing as in connectedness), all of which fit Christ's character. That said, there is a time for anger and frustration in music of social commentary, which a fair number of Christian musicians tackle (Mark Heard, for one). As architects say, form follows function, and rock can fit Christ's intentions.
To the rest of the thread and original article: the writer has a hard choice between writing about the average, the fringe, and the true roots of Christian music, and comparing them and the current Christian music, to the range of current non-Christian music. To say there's no connection/progression between one type of original Christian music and a different type of current Christian music is like saying gee there's no link between rockabilly and thrash and Lou Reed and motown: true but pointless.
Is all Christian music excellent? No more so than *all* non-Christian music. Both encompass a wide range of communicative intentions, it's pointless to compare those ranges like they were one thing. Christian rock had multiple origin(ator)s and intentions beyond those listed in the article. It might not all be great art (and a fair bit of it is) but the message has a truthful timelessness that transcends any schlock factor.
The article ends with a gratuitous dig at Christendom for "shunning" one cited founder. The point missed is, that founder found solace and forgiveness and regeneration in Christ, the only God who (1) really has any basis to say what the laws of life and the cosmos are and judge and (2) came off the bench and accepted a death sentence for anyone else. The writer shows a comparable intolerance for Christendom to what he accuses those Christians of. But again, there's forgiveness for that, and for anyone who qualifies under "nobody's perfect". And it's this grace and restoration that inspires great (and mere good) worship music (ie, love songs to God).