If he is talking about a "church" that is not preaching the gospel at all, but is simply scratching the itches of it's congregants with religious sounding messages, I would agree. But if the message of salvation through faith in Christ alone is being preached (even if the rest of the messages on "life-skills" etc. may be a bit off) and thousands of people are gaining eternal life because they are hearing the gospel at that venue, I for one am going to rejoice (even while I am praying that the pastor's messages improve in other areas)
If getting people "out of hell" and "into heaven" were all there was to it, and if "quality" was somehow optional for the process, then I could see your point. But you set up a false dichotomy by saying since we can't get perfection, we shouldn't bother trying to get better.
The Great Commission does not command us to "go ye therefore and make converts of all nations". It commands us to make disciples. Disciples do more than learn how to make more converts. If your theology teaches that Christians shouldn't "polish the brass on a sinking ship", you probably discount or avoid other ship-related disciplines as hull & sail repair, mastering sea-sickness, and simple navigation. What good is it to ask people to repent and convert, and not prepare them for how to live afterwards?
The gospel's content is more than just "get out of jail free" instructions, and the proper response is more than the empty-headed repetition of a prayer. There is far more that the Church is called to do for it's members than to just to be "seeker-sensitive" and count converts.