I mostly stand against the "mega-church" issue. There are some pluses and minuses. I've mostly found minuses.
I have attended both a mega church and a small hometown type church. I think the mega church idea was being spread recently by Willow Creek. I can't recall the pastor's name there, but eventually he got into cahoots with Rick Warren, author of "Purpose Driven Life" and a lot of other spin-offs. When I was having trouble deciding if a church like this was for me or not, I did a google search and found all types of articles against these two guys and their style.
Another message board I frequented posted a lot of links to articles about this type of thing and these two guys. They seem to gear church services towards the "unchurched Harry and Mary". One author wrote about attending Warren's church, Saddlebrook or something like that, and how they didn't even have a cross. Looking at the building from the outside, one would not even know it was a church. It looked like a college auditorium. Supposedly, the idea is to make people feel comfortable and have a non-invasive envrionment. So, taking Jesus out of church just to get people to attend is really saving souls? NOPE! The author wrote about how he felt like he was at a concert or theater or something because it all seemed geared towards entertaining people. If the people were entertained and didn't feel threatened or convicted, they would come back. The Sunday messages were all about how God can make you feel good about yourself and make your life better, etc. All things to make the person feel good about themselves.
Anyway, the "mega-church" I attended for about a 3 month span, was a member of Willow Creek and had a congregation of about 3500. Yeah, they had a lot of activities, but do we go to church to be entertained with activities? I don't. I've mentioned this before on other posts, but there's a movie called "Time Changer" about a bible professor in the 1890's that goes into the future to 2002 to learn what happens when we remove Jesus from society. He visits a local church that appears to be a mega church and he can't get over how the church is so geared towards entertaining and how they have all these activities, but when he goes to the visitation night, where the church visits new members or those interested in learning about Christ or the church, nobody is there. They have huge turn outs for movie night and bowling night, but not soul winning night. Anyway, good flick. Changed my view about what the church is supposed to mean to me.
I've rambled long enough. Basically, I'm against them for the most part. How can you save souls if you don't even know the names of the people in your church and you're too busy entertaining the congregation? Take Jesus out of church to make people foeel comfortable and non-invasive? Gimme a break! Of course, early churches int he Apostle days had congregations in the thousands, too.
God Bless