I have nothing against house church, but:
I know of none that preach the Oneness,
Acts 2:38 message, and I just can't get excited about people making a decision for Christ and not receiving the new birth.
It is not impossible but unlikely that the 5 fold ministry and 9 gifts of the Spirit are going to be in operation in a handfull of people who are not in fellowship with the larger body of Christ.
There is much benefit in being with a group that has Bible quizzing, youth, ladies, & mens retreats, organized outreach, pooling resources to feed the poor, and help the needy, support missions, ect.
The UPC church that I'm attending has seen thousands baptized and filled with the Holy Ghost. We have daughter works throughout the county to reach people, We are seeing people being baptized and filled on a regular basis. We support missions, have a bible teaching institute, support young evangelists with opportunities to minister. At the moment we are collecting 25,000 shoes for the people of Haiti.
We are doing so much more to advance the kingdom, than we could sitting home by ourselves focusing on our small differences, versus coming together and having revival.
We are in a 40 day progressive fast right now, and the Spirit of God is so pervasive and in evidence in our meetings that people are being filled, healed, delivered, changed, empowered, renewed, encouraged.
I would not trade this precious treasure, my Pastor and church family, for anything.
And I know I am where I'm supposed to be.