Rex Miller again: "The Attractional Church does not properly distinguish between worshipers and musicians. In fact, in this model, only the beautiful ones are allowed to be “on stage.” And, furthermore, they must smile, be peppy, and radiate that everything is “great.” That is the bias of a broadcast-based church model.
This model is about first impressions. In other words, many people who know nothing about Christian reality or culture are sitting out there in the audience. To connect with them, you must present people who are cool and hip.
So, what happens when you have someone with a great heart for God, but not the best voice and not the most attractive appearance? The bias of the model relegates them to the place in the back. Worse, it disdains the real heart of worship." read the rest here
Again, Miller's point touches an important point about leadership. Of course one aspect that must be considered is competency. The more gifts and ability you have in any area of leadership makes you more qualified to be used as a leader. There is no way to guarantee that a gifted person possesses the right 'heart' for the ministry they are called to.
I have witnessed well-intentioned people whose heart is, 'in the right place' cause major upheaval in a congregation due to thier lack of competence. I have also witness extremely gifted people flaunt thier beautiful 'attributes' in ways that alienate people from receiving the 'ministry' they are trying to do.
I have recognized - that I have strong preferences in terms of who I want to work with me in leading music or other ministry.