Just my opinion based on what I've seen - I knew one powerful (in the faith sense) huge church back in the 80's. It was spiritually ALIVE and you could feel the Holy Spirit the moment you walked in the door. It was a big part of the Jesus movement - lots of hippies.

Since then the large churches I've been to are mostly like well-oiled social clubs. Since I like hanging out with Christians, I do like that one aspect of them. You can find God wherever you seek Him (since He is everywhere) so I can enjoy being there, but the corporation aspect is problematic. Many things are done to preserve the existence and finances of the corporation, and decisions are sometimes made based on what is best for the corporation and not "whatever is God's will". I cannot support that. I have found that there is very little spiritual power in those massive places. Plenty of people in them that love the Lord, but...they're all babies in a way.

I love small groups or even just hanging out with groups of Christians (because Jesus did say that wherever two or more are gathered in His name, He will be there in the midst).