Bible teaching, even in the best of venues today, has been deliberately dumbed-down, made as broad and as shallow as possible, oversimplified, adapted to the lowest common denominator-- and then tailored to appeal to people with short attention spans. Sermons are almost always brief, simplistic, overlaid with as many references to pop culture as possible, and laden with anecdotes and illustrations. (Jokes and funny stories drawn from personal experience are favored over cross-references and analogies borrowed from scripture itself.) Typical sermon topics are heavily weighted in favor of man-centered issues (such as personal relationships, successful living, self-esteem, how-to lists, and so on) --to the exclusion of the many Christ-exalting doctrinal themes of Scripture.
In other words, what most contemporary preachers do is virtually the opposite of what Paul was describing when he said he sought "to declare...the whole counsel of God" (Acts 20:27)….
....By contrast, today's church-growth experts seem to have *no* confidence in Scripture's power. They are convinced the gospel needs to be "contextualized", streamlined, and revamped anew for every generation. Forty years of that approach has left evangelicals grossly untaught, wholly unprepared to defend the truth, and almost entirely unaware of how much is at stake. The evangelical movement itself has become a monstrosity, its vast size and visibility belying its almost total spiritual failure. One thing is certain: the cumbersome movement that most people today would label "evangelical" is populated with large numbers of people who are on the wrong side in the Truth War.
Excerpt from pages 166-167 of The Truth War by John MacArthur