Interesting article, thanks!
I'm no expert on the Copts, so I don't know if there's more here that they would feel depicted their Church in a bad light. The only thing I picked up on was the "language issue". And honestly, that's a problem in many Eastern and Oriental parishes of all stripes. Maybe some people would read that and think the Copts aren't interested in assimilating or something, but I figure most people will just assume the Copts "cater" more to immigrants or focus more on maintaining old world traditions, whereas Evangelicals are usually more "modern". It's not the whole story, but it's not abhorrent.
At any rate, most Coptic parishes I've been to seem to have more than one priest, and so they can have an "Arabic" and an "English" liturgy every Sunday; and in the parishes with one priest, there was always a good balance of the two. And every Coptic parish I've visited has projected the full text of the liturgy (in three languages) onto projector screens or flat-screen TV's set up in the church. I'm not that big a fan of using modern technology in this way, but I've gotta admit it makes it easy for almost anyone to follow what's going on.