I thought MGM was just okay. If you are a big movie buff or love Hollywood, then I could see how it would be really enjoyable, but otherwise, I think it's just okay for Disney. The highlight of this park for me was the Lights, Camera, Motors Stunt Show. I'd recommend this for anyone, even those who are not into cars. It can get pretty hot, so I'd sit up high or by one of the fans, as the flames and pyros can make it even hotter up close to the stage. Also, this is a *loud* show, so be prepared if you have young kids that might be bothered by this. Star Tours is a good thrill there, without being quite as intense as other rides like Tower of Terror. The park seemed small compared to the others, and the theming not quite as nice as some of the other Disney parks. I'd say you could do this park in a half day, unless you are really into the whole movie/Hollywood scene, in which case, you'd probably really like this park.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.