"I stopped attending mass when the tambourines and the rock band arrived. It didn't mesh too well."
I don't think my voice teacher would approve of those instruments either. I also do not approve of them. The mood for worship is NOT set by loud instruments.
Well, I played in a rock band for a decade so I approve of them if - and only if - they are used appropriately.
In this instance (eesh) they are not being used appropriately. If they were used to help people stay on key and/or help set a base tempo, that would be fine.
It really sucks when you wind up sitting next a crash cymbal...its very hard to do anything after you've been rendered stone deaf.