Something occurred to me not all that long ago with regard to what the New Testament says about how the church did things or how the church was commanded to do things. And, that is... the lack of detail.
When you examine the historical narratives of church meetings from Acts and make inferences about how the church apparently did things in the epistles, we're just simply not given a whole lot of detail of how they did things, as well as when, where, and in what order they did what they did. That creates problems when we try to implement a strict "follow the pattern" scheme.
We're looking for a New Testament version of Leviticus to tell us specifically how to worship with liturgical precision... when there is none. All we really have are references to coming together to partake of the Lord's Supper and really only generalities beyond that (i.e. singing, praying, edification, etc.).
So, we have not much ground to stand on to criticize the way others implement their assemblies when we have no more specific authority for how we do everything we do than they do.