This movie has a strong start. Nic Cage's (over) acting is bonkers and, at first, the plot just moves fast, blazing through crazier and crazier scenes. Gary's relationship with Marci and her daughter is kind of endearing even though a little sick, and both have a nice chemistry; God's appearances are also nuts and funny and Gary himself, yes, is portrayed as annoying but also lovable and good natured enough that you can understand why people around him like him.
You are presented with this deluge of stupid and ridiculous scenes that forces you to stay engaged because of how crazy they are. And you are left in a confused daze not knowing what it real and what's complete fantasy.

But by the time Gary actually gets to Pakistan things shriek to a sudden halt. The film -as well as Gary- starts meandering through a boring slog. God's mannerism start getting repetitive and infuriating, Gary turns into an excuse to show the streets Islamabad and his interactions with the locals seems like if Borat suddenly crashed this movie. So basically the last half of the film is just boring with the exception of some marginally funny jokes masterfully delivered by Rainn Wilson and with painfully unfunny confrontation with OBL that looks as if it was lifted right up from one of those epic movie-like parodies.