As Music Director of a large church near San Antonio I walk this slippery slope all the time especially with the youth mass - timwat as always is a beacon of light in a sea of opinions, some well grounded & some not.
Music in a true worship environment should hit three marks... musical, liturgical & communal, communal being the key word here. Do I always meet these criteria, nope... but it's something to strive for.
There's some very cool hip fun music out there that I would love to sink my chops into but it tends to be more performance, rather than communal music that invites the congregation to participate. Granted a younger bunch will respond to the contemporary music (yes I do several songs like this in a youth setting & they love it) but it kinda becomes more "in concert" than song leaders in a house of worship, like I said - a slippery slope I'm guilty of falling into the "performance" abyss more often than not.
A question I always ask myself & pose to the choirs (I have five) is... who's glory are you doing this for?