Like other franchises around the world, the concept and implementation of Pinoy Big Brother has been a subject of controversy and criticism from the Filipino public and the news media. Investigations of some incidents were held by numerous organizations, including Endemol, the franchiser of Big Brother, and TV watchdog MTRCB since its launch in 2005.
On its first week alone, the show was already given a stern warning by the Movie and Television Review and Classification Board (MTRCB), the Philippine censoring body for cinema and television, saying that the show airs content that is definitely not suitable for children, such as talk on contraceptives and very "intimate scenes". ABS-CBN is reported to have acknowledged this and had promised to make an "improved" show more suitable for younger audiences in the coming weeks. As a result, as scenes like these are unavoidable at times without interference, each episode begins with a warning reminding viewers that some scenes in the show that are not suitable for young audiences. In spite of this, though, the scenes that were deemed to be way beyond the parental guidance rating given by the Board were still shown. In this light, MTRCB ordered the program suspended for one episode. As compliance, the program was not aired on September 25, 2005, the day after the 2nd eviction night.
Columnist Nestor U. Torre of the Philippine Daily Inquirer has also given a doubtful but optimistic stance on the show, saying that while the scenes are chaotic and challenges in the first week were way too mundane and cheesy, he is hopeful that more compelling tasks would be given to the housemates in the future and the housemates' personalities will become clearly defined. However, Torre wrote in a later article that in the first week alone, the show emphasizes more on creating controversy (such as sex) rather than exploiting the potential psychological factors and showcasing human nature. Despite this negative publicity, ABS-CBN itself has reported that the show is so well liked that it extended its run to all seven days a week. In fact, not only its on-air talents have defended it, but viewers themselves (as shown on ABS-CBN programs) can attest to it. It also inspired the creation of fansites.