Although a fan of both Star Wars and the "Avatar - The Last Airbender" TV show (written by the same folks), this movie was very disappointing. All action and no substance makes for fun eye candy, but it is little more than a video game you're not playing. The animation was huge in scope - the battle scenes were very impressive - but stiff and clunky when it came to the characters, which, as George Lucas has always said, need to come first. All the impressive special effects animation in the world can't save a boring story told with wooden characters, which is exactly what goes wrong with this film. I would say skip this unless your kid is already a huge Star Wars fan, like mine is, in which case it's a watchable waste of an afternoon.
I wasn't sure what to expect, or even if I cared after years away from the series, but I was pleasantly amazed by this film. I would warn any casual fans of the show (or those completely clueless about the series) to stay away. Although the basic storyline is easy enough to follow, the emotional subtext will be completely lost if you are unfamiliar with the characters and their past. This was a complicated, challenging, and thoughtful film for adults (I personally cringe at the PG-13 rating - although there is little "bad" language and no nudity, the topics and themes addressed here are not appropriate for a 13-year-old). The film meditates on when keeping faith in something crosses over into causing more pain than it is worth. Scully wrestles with whether or not to continue a painful experimental treatment on a dying boy. Mulder becomes obsessed with a murder case, which seems to crumble his long-term relationship with Scully. A former child molesting priest has visions from god about the murder. All of these elements are handled in a sober, open-minded context and resolved in a satisfying (if not definitive) way. I cannot remember the last film from Hollywood that treated it's audience with the assumption that they were intelligent, informed and empathetic enough to understand the character challenges presented here. To me, the series ended with an appropriate yet unsatisfying finale - this film shows us where these characters went and brought them (for me, anyway) to a much more satisfying and rewarding conclusion. If you loved the show, I can't imagine you not enjoying the film. If you were on the fence or unfamiliar, I suggest staying away. True Believers will be rewarded for their faith in the show, but doubters beware.