Lord of the Rings is a movie that adheres to its own "rules of cinema". (Not every movie features Balrogs from the pits of Angmar (hell) spurting flames, with a old and gray man fighting it, falling through time and space........etc). Anyways, my point is, is that it had unreal elements in it, and all three LoTR movies were blockbuster.

Therefore, each movie has its own "rules". Such is the case with Final Fantasy, Advent Children. It wouldn't be final Fantasy, if it didn't have unreal jumps and action scenes. The basic laws of nature instilled in the game had to be adhered to in the movie (i.e. being able to take 1298270938472 bullets, and still having enough HP to whoop the enemy).
But you forget, this is a movie, not a video game. They are two very different mediums with two very different rules of execution. In video games you expect items to pop out of nowhere when an enemy is defeated, that a character can leap unreal distances, that explosions will never touch your character so long as your careful and that a single item can rejeuvenate a character within seconds no matter how bad the damage is.

Advent Children is a movie, and one that has no rules whatsoever other then a childs made up mentality of whatever is convenient or strikes their fancy. Didn't you notice how tifa is quick enough to flip into a position to leap from a wall when she is thrown by loz, yet is inexplicably slow enough to stand there as Loz snickers and fires off his weapon into her midsection? though, to be fair, sephiroth fell prey to the same plot contrivance. He somehow blocks and parries clouds every slash, yet just floats there and lets himself be sliced six times. How does that make any sense whatsoever in a storytelling, or gaming context? Also notice how marlene is pissed at clouds selfishness then forgives him in the space of a few seconds for no reason whatsoever? And what was up with the sub-plot with the children, there had to be about a dozen ways to get cloud out to the forest without introducing a redundant and pointless sub-plot like "Kids eat up kadaj's excrement, turn momentarily into ninja zombies."

LOTR exists within it's own context, but abides by the cinematic and storytelling rules of it's context. Characters who are injured severely cannot fight. Characters who "Die" and not "fall into darkness" are dead. It sets up it's own rules, then plays by it and lets the story play out respectfully.

I like the LotR reference, which nobody had a problem with. Frodo was the same wuss-ass at the end of all three just like at the beginning, no character development at all, Cloud had freakin more then him, so what's the problem >_>!
No offence, but did you even SEE the LOTR films? Frodo goes from being a country bumpkin who dreams of having adventures like his uncle, to being turned into a puppet of a evil entity. He became every bit the ring junkie that bilbo was, and more so. So much so he identified with gollum when he saw what the ring had turned him into. He was so devastated and corrupted by the ring, that he could no longer remain in the shire and had to leave with gandalf and the elves to the undying lands. I'd call that a heckuvalot of character development.