You get many movie sequels, but you don't often get spin-offs. In this case it is Russell Brand returning to his Aldous Snow character from Forgetting Sarah Marshall. It can be a bit risky featuring too much of a funny character, however I thought that the this film was quite funny.
The also marks Jonah Hill's first leading role since Superbad three years ago. He plays more of a “straight man” role in this one, however there is still enough familiar elements to make his performance still quite funny.
Overall, I feel that Get Him to the Greek ends up being a successful spin-off that stands well on its own.