The mini-attraction is a rip-off of "Honey I Shrunk the Audience" ... it's entertaining for the kids, but pretty cheesy on the whole. The M&M memorabilia in the store is cutesy kitsch, and browsing around here is a good break from the heat as you're walking down the strip.
If you're going to hit this place, Coke World is definitely another destination for you to hit while in Vegas.