A couple of thoughts:
-There's a huge difference between saying, "I don't like (whatever)," and "(Whatever)'s not of God."
We should take great caution before making the latter statement. Some folks throw it out quite flippantly. Jesus frowned upon folks deciding something wasn't of God when, in fact, it was.
I also don't get the folks lining up the soldiers along generational lines to fight the worship wars. Our church has different likes, and dislikes. But we teach the younger to appreciate the richness of time-tested music that honors God...and we teach the older that God is indeed speaking through the younger generations of musicians and lyricists.
Finally, we teach everyone that worship is so much more than music...and that giving in to the temptation to fight the worship wars does little to advance the Kingdom...and much to mess up the spread of the Gospel.