Yes, it's quirky and offbeat. The characterizations are well-done (I really enjoyed Stiller's portrayal of the "sidekick").
But the plot itself is a bit contrived; plot developments tend to appear out of thin air, rather than as a result of the actions of the protagonists, and some of them feel clumsy.
The pacing is irregular, dragging through characterizations then spurting forward with developments, and then repeating the cycle (which, admittedly, isn't necessarily a detraction from a movie, but I noticed it and didn't like it in this one).
All in all, it was a pleasant enough diversion, especially if you like the lead actors, but ultimately forgettable.