I almost hate to say this, but it seems that, in America, anyway, these two types of church are incompatible.
The church that I attend now is a mega-church: about 3500 members. Needless to say, doctrine is small potatoes. This church is all about worship and preaching the Gospel, which is good! However, it leaves the more mature members, like myself and my family, missing out on a lot of stuff. In order to reach as many people as possible, our pastor tries to teach according to the lowest common denominator. He further avoids "touchy" subjects, like the total depravity of man and his inherent unrighteousness. These kinds of things are offensive to non-believers, and while being entirely biblical, it seems that he doesn't want to paint the church as preaching "fire and brimstone." But it's hard to deny the success the church has had. Our pastor's humble and loving character really wins membership (hard to tell what the "elect rate" might be).
Anyway, that church is planting a new one, which my family and I are going to be a part of. We're going to be a part of the church plant team. This new church is lead by a Dallas Theological Seminary graduate with a zeal for the Word and the preaching of doctrine. Our new pastor has come right out and said that he doubts it will be a very big church. He will definitely be preaching the Gospel and will be faithfully praying that he would be enabled to win souls, but he does not suspect that the church will grow over 400. It will be a church for those who really want to grow in their faith. The mega-churches get 'em saved, and we'll be getting 'em "learned." That's the objective of this new church. I pray earnestly to God that he would enable me to be a part of this new church in a loving, serving way. Whether it's having an ordained teaching role, or simply being able to love people one at a time, I pray that I would have the opportunity to serve.
I'm not saying that churches that teach sound doctrine and lots of biblical material with traditional worship are incapable of drawing huge numbers. I'm simply saying that most people don't want that, so you will likely not draw as many members as churches with more modern, less "offensive" formats. Perhaps that's a good thing, though.
Soli Deo Gloria
Jon