Marcus,
There have been several discussions about that topic here and a search may prove to find a few of those. As far as the multi-site, as I have heard how they operate, lack in some very serious ecclesiastical areas.
1- A distant pastor cannot know and minister well to his congregation.
2- If the minister "visits" via TV screen, he is entirely disconnected from the congregation.
3- How is the session (and the offices/officers overall) supposed to minister, rule, discipline, and administer mercy from 20, 40, or 200 miles away?
It depends on the model. The majority of churches that are technically "multi-site" do not fit any of the above characteristics. In fact, the particular church cited as an example in the opening post does not fit any of the points in the description put forth in post #2. So it's important to state clearly what sort of multi-site characteristics we're talking about.
I grew up in a multi-site congregation. There were two communities, 12 miles apart, barely large enough to support a single pastor between them. The church had morning services at one site and afternoon services at the other. Some people attended both services. Elders come from both. They knew the people and practiced personal shepherding. The pastor preached and did visitation in both communities. No sermons were beamed anywhere on TV.
Then when I was in college, my college-town church held morning services at a building "in town" and evening services in the student union, so that church was multi-site too. Again, there were practical advantages and shepherding in no way suffered. In fact, pastoral care was surely enhanced by the two-site approach that got the pastor and elders onto campus.
So, the celebrity-pastor-with-a-beamed-in-sermon concept has some implications that concern me, but still we must not assume that there's no on-site elder leadership at all at such churches... and we certainly must not assume that most multi-site churches fit that model.