I'm seeing a lot of negative reviews and reading their complaints you can tell they didn't really pay attention to the show. Not only that but they didn't pay attention to any of the following material after MMPR. If you're going to complain at least get your information correct.
For what it is I'll have to say it's pretty good and worth a watch. Yeah, some of the story could've been better, but given the circumstances and the budget, I think they did a rather good job at it. It's a nice nostalgia ride for any actual fan of the MMPR.