Our hoity toity local public radio reviewers actually liked it, basically saying "What do 5 year old kids like? Monsters, and trucks!" So they agreed that 5 year-olds will love it, and it's got the new McGyver guy, so there's that.
I think it must have been made a couple years ago because the McGyver guy looks a lot younger.
My dad normally can't stand kids' movies, but he took my kids to see it last week and said he really enjoyed it. My husband also went and said it was great and he highly recommends it. I regret now that I didn't go too!