I think it's entirely more disappointing when a film has potential, and the director decides to just waste it away. The second half of the film feels completely rushed - it really feels as if David Fincher just gave up halfway through and said "wrap it up guys, I have better things to do"
Nick was a doofus and Amazing Amy could've schemed her way to a better life. Instead, she went back to big ape man. I didn't enjoy the scenes where BAP was involved. The end part where Nick, Go, cop, and lawyer (the whole Scooby gang) were all sitting together was weird. Also, I couldn't unsee Barney.