Worship teams can inadvertently foster elitism within the church.
Because of their skill, no one else in the church can keep up with them. I personally find this a distraction because I very much prefer to learn songs by following the score. Worship teams, if not carefully maintained and supported, can become a vehicle by which the musical education of the congregation is inhibited - or prohibited. This is because a rote learning approach to acquiring songs produces quick results, but ultimately doesn't provide a technical musical education. It's a lot like giving someone a fish as opposed to teaching him how to fish.