For starter, they hired Shawn Levy to direct the flick. A real hack for a filmmaker, I'll say. Even though he graduated from Yale with honours at the age of 20, but I still say he's a hack.
He directed the 'The Pink Panther' remake. What a mess that one was. He also did 'Just Married' and 'Cheaper by the Dozen'. The screenwriters aren't much better either, Ben Garant and Thomas Lennon did the screenplay for Taxi, The Pacifier, Herbie Fully Loaded, Let's Go to Prison and more.
Really, the concept of this movie is great and fun but they decided to hire some hacks to make it.