The Watch is a decent comedy overall. It has enough humorous moments to make you laugh from time to time. The humor gives the film a clearly comedic character and supports the generally positive impression of the movie.
The movie also feels fairly large in scale for a comedy. It gives the impression of having a broader scope than a very small production. That sense of size is noticeable and helps distinguish it from a more modest comedy.
Aliens are part of the movie as well, giving it a noticeable science-fiction side. Their presence brings in a few sci-fi effects. These effects are limited, but they give the comedy a light and clear sci-fi touch.
Overall, The Watch is a decent movie with some laughs, a fairly large scale, and a small but noticeable amount of science fiction.