So.. Robert Reed was right.

From Robert Reed's Wikipedia:

From its debut in September 1969, Reed was unhappy with his role of Mike Brady. He felt that acting in the often silly sitcom was beneath his serious Shakespearean training. Producers and directors found Reed difficult to work with both on and off the set; the cast, however, got along well with him. In his efforts to bring more realism to the show, Reed often locked horns with the show's creator and executive producer, Sherwood Schwartz. Reed regularly presented Schwartz with hand-written memoranda detailing why a certain character's motivation did not make sense or why it was wrong to combine elements of farce and satire. Schwartz generally ignored Reed's suggestions. In a 1983 interview, Reed admitted that he often butted heads with Schwartz stating, "We fought over the scripts. Always over the scripts. The producer, Sherwood Schwartz, had done Gilligan's Island...Just gag lines. That would have been what The Brady Bunch would have been if I hadn't protested."