The Macross Frontier movie (False Diva) is just seven kinds of weirdness. Usually a summary movie is essentially the series boiled down into the core plot, along with a few new wrinkles, usually stepped up designs and action sequences, etc. What you don't expect is an entirely different viewing experience.
For instance, the Macross movie echoes the series in many ways and pretty much ends roughly the same as the main plot in the series, though the way things happen may be fairly different. They're not totally jarring... in Macross, they explain away the movie(s) as a retelling of the plot done at some future time in the same universe. In other words, it's a movie made in that universe of events that happened earlier, so they can get away with changing things around from the original plot (which, in the case of the series, is the "true" history).
Anyway, Macross Frontier is jarring in many ways and the core of the plot is entirely reinvented. The Vajra are the baddies and are just that--continually bad. It's sexed up in many ways (there's a semi-naked Sheryl and she talks of being "all natural" in a world of implants), Alto already knows Ranka at the start, there are no human villains for the most part (I don't think, I might have skipped ahead of something), etc. The Vajra are defeated in a lengthy sequence--they don't really get into much behind them at all, other than "oh hey we wiped them out, let's sing!" On top of that, I didn't really like any of the new songs, and the old ones felt mis-used. They also redesigned the Vajra big ships, etc.
In any event, like I said... it just feels weird to watch this and have to basically re-learn everything all over again.