Melissa McCarthy is funny. She was hilarious in 2011’s Bridesmaids and in last year’s The Heat. And she brings some laughs in Tammy.

But this movie doesn’t fly. It falls short in the hilarity department. It lacks memorable scenes. And, sadly, McCarthy’s act becomes tiring.

Also, this is another comedy that reveals some of its best stuff in the trailer. (Nonetheless, the trailer is posted above.)

Essentially a road trip movie with Tammy and her grandma Pearl (Susan Sarandon), Tammy is blessed with a talented cast. Tammy’s mom Deb (Allison Janney), her dad Don (Dan Aykroyd), Pearl’s cousin Lenore (Kathy Bates), Lenore’s partner Susanne (Sandra Oh), Pearl’s hookup Earl (Gary Cole) comprise a strong crew. Toni Collette plays a mostly silent woman who shacks up with Tammy’s husband (Nat Faxon).

When Tammy catches her husband cheating (after her car hits a deer and she gets fired from her job), she escapes with Pearl on their adventure. After they end up in jail, Pearl uses her remaining cash to bail out Tammy. Tammy then robs a fast food joint to then bail out Pearl.

The robbery is slightly funny. It tries to be one of those “spontaneous” bits with some ad-libs—like the one McCarthy had in 2012’s This Is 40—but it doesn’t quite score a knockout.

McCarthy co-wrote the script with her husband Ben Falcone, who directed. Falcone (who played the air marshall in Bridesmaids) also plays the boss who fires her early in the movie.

Tammy is the kind of movie to watch on cable or Netflix sometime next year. You’ll be somewhat amused but not overwhelmed.