A film that largely works because of its strong cast. Walter Matthau and Joan Plowright are pretty much perfect casting as the Wilsons, and Matthau in particular is giving his all here. The cast of kids actors is good too, and I think Mason Gamble gives a particularly entertaining performance as the titular character.
The film also does a good job of having kids act like kids. The kids in this movie feel real, and I found myself laughing or smiling at many of the things they were saying.
The film does lose a lot of stream by the end, particularly in the last 20 or so minutes of the film, which is basically just Dennis torturing Christopher Lloyd's villain character in slapstick ways. The slapsticks start to get old fast.
Overall though, I do give this film a recommendation. I found myself enjoying it as mostly cute and light entertainment, whose talented cast really made it a enjoyable watch.