Similar to Harry Potter, adopted from a fantasy novel that is not exactly the pride of the literary world, the Twilight series does offer an interesting fantasy world. But ultimately, for the movies at least, the main attraction would have to be the action. It is therefore not hard to understand why both split the final book into two parts. The first part is the setup which incidentally (not intentionally, I'm sure) milks the cash cow to the last degree. Breaking Dawn Part 2 movie will hopefully redeem the movie makers from the curses of the segment of the audience less endowed with the virtue of patience (the majority, I venture to guess) with the action set piece of grand finale for which they have waited so long. In that department, Breaking Dawn Part 2 online did well.
Perhaps a little recap would help, particularly to forgetful souls such as myself, on small details like to kill a vampire, you must tear out its head and toss it into a roaring fire.
"Twilight" and "New Moon" are essentially very, very long establishing scenes focusing respectively on the two heroes, vampire and werewolf who, because they are not French, cannot resign themselves to a peacefully coexisting triangle with their shared love object Bella Swan like Jules and Jim. After these preliminaries, "Eclipse" becomes the most packed and entertaining, not only with the heightening of the tension in the love triangle, but also with intriguing side stories (flashbacks) providing more dimensions of some of the characters including the wolves (how there animosity with the vampires developed) and members of the Cullen vampire family Jasper and Rosaline. Throughout these three movies, we also see the growing menace of the dominating, powerful vampire empire of the Volturi family in Italy.
Developments - finally, in "Breaking dawn part 1", leading the audience through two key events, marriage and childbirth. The movie ended with Bella after giving birth and struggling on her sick bed at the brink of death, suddenly opened her eyes, with the iris turned red.
Not much needs to be said about the rest of the story, told in this "Part 2". A very thin, unconvincing plot surround the strangely fast-growing child Renesmee (something like 10 times faster than normal) led to a final confrontation between the Volturi on one side and the Cullen family (now with Bella as the strongest vampire of them all) assisted by a generous assortment of friendly vampires gathered globally plus, of course, the wolf pack. Soccer fans may think of this as a sort of World Cup that comes once every four years, with strong teams such as Russia, Ireland, Italy and Brazil.
To reiterate my summary line, I promise I will watch Breaking Dawn Part 2 if action is what you are looking for, you should be satisfied. The twist of sorts in the ending is also meets with general approval, it would seem, from audience and critics.