1) While Adsense is a popular publisher program, it has some disadvantages for publishers such as visitors ignoring ads and lower revenue than other programs. 2) Adsense ads have become overused and "tacky" which can negatively impact brands, and issues like click fraud reduce advertiser returns. 3) Publishers can earn higher rates with other programs, so problems may arise for Adsense if publishers decide to use alternatives. Google needs to address these issues to remain the market leader in content advertising.