I like buddy comedies.
A lot of this movie was hard for me to watch. The dialog can be painful. On the other hand, the predictable lessons taught are great. The movie ends strong. The audience was into the movie and laughed easily. I went with Pumpkin, Squash (my sister-in-law) and my mother-in-law. One gauge I use regarding whether a movie is engaging is if mom is awake during the entire movie. "The Internship" passed this test. Mom, who fell asleep in the car on the way to the theater, was awake the entire show.
Vince Vaughn is the kind of guy with whom I would like to spend time. He is someone is entertaining just being himself. So, the movie uses this quality. In fact, it kinds depends on it.
Finally, it is a commercial for Google. I now love Google.