Hey, _I_ am the 'doesn't make sense'-poster, not you!
Just kidding, but I thought it'd be funny to have this kind of title.
Actually, I want to list why this is a good sequel.
Sequels don't usually work very well, they rip off the first movie, or they break the first movie's carefully crafted story or time travel explanation or some kind of structure, or change the chracters too much, etc. Just look at 'The Terminator (1984)' with its near perfect bootstrap paradox that one could easily see happening in real life, and then what a mess T2 is, just crapping all over that paradox, destroying everything that made the first movie so good, or the 'First Blo..', oh, sorry, 'Rambo-franchise'.
Even the names don't make sense, and the character changes drastically from movie to movie.
The less said about the nonsensical and cartoony, forced sequels to 'Back to the Future', a movie that wasn't supposed to even have sequels originally (the last bit was supposed to be a joke, not canon), the better.
I don't know what it is exactly, but it seems like when you look at things from the story and motivation perspective, you can see how some movies have perfect sequels, others have absolutely horrible ones, and yet others have something inbetween, mostly 'lukewarm, unnecessary' ones.
George Lucas was a weird creature before he sold his soul to Mammon. He used to have some kind of creativity, and he got a weird 'treatment' from somewhere, that was too big for one movie, so they made it into three, and there was still some leftover stuff, so he decided to make the three movies the 'middle part' and then create the beginnin and end at a later time, Clone Wars and all that.
This was an exciting thought in the eighties - oh boy, more Star Wars-stuff, but different!
That is what makes this sequel possibly the best ever - this is literally 'more Star Wars-stuff, but different'.
There are a few points this sequel does that most sequels don't.
- The story is a continuance, but yet completely original and almost independent of the first movie - it's a different story, it doesn't repeat the first movie's story at all
- There is tremendous character growth, and there are in-depth story elements that are slowly revealed (if a bit retconned as well), that build to an amazing reveal
- It's not a completely happy story, it ends in a stressful cliffhanger that's well-crafted
- It avoids the stupidest romance cliché (while still containing annoying injected romance, though, but at least it's not a wimpy nerd, like in romantic comedies, but a man and character women all over the planet lust for, however secretly) of 'Iloveyou - Iloveyoutoo', and this ACTUALLY UPSETS some women viewers, to my astonishment.. how robotic do they want their entertainment, stories and men to be??
All in all, with this sequel, they do everything right - they EXPAND the view to the Universe, they show us more (but not too many) characters, they bring the story FORWARD without apologizing for it, they bravely blaze NEW TRAIL instead of giving us the same-old in new package, and it works!
Too many moviemakers seem to be afraid that if they make a sequel, it won't be as popular, because it might be too different from the first one, so they try to copy and refer the first movie as much as possible, losing creativity and spark in the process, that made the first movie so good in the first place.
The usual mistake is trying to make 'exactly the first movie again' without daring to venture to completely new territories. So they try to give 'more of the same' to the viewer instead of 'more of the different', which sequels should be.
In my opinion, sequel should ONLY be made if the story 'demands' it, or at least if the story can be expanded and brought forward without copying the first one. What does T2 do but copy the first one without any of the poignancy or atmosphere? What does Back to the Future II and III do but rip off the first movie - heck, they even go to the exact same year, 1955, when they COULD be going to the ancient Egypt or Napoleon's time or any kind of interesting historical era! No, we MUST do the same stuff the first movie did.
The only way Back to the Future II differs from the first one, is that its plot is as convoluted and messy as possible without giving any payoff for it - it follows a damn macguffin most of the movie, INSTEAD OF GIVING US AN INTERESTING STORY about something more meaningful. Chasing an object the viewer becomes just a dog that fetches the ball for the director!
THIS movie did it well. I am glad there's a perfect example of how to do a sequel well. Sure, much of it doesn't make sense, but compared to other movies, this one is definitely a masterpiece.
There's even a training montage in it, which I ALWAYS love, even in stupider movies, like the Rocky series - Rocky IV is my favorite because of the amazing soundtrack and the great, funny montages, and the 1980s energy and vibe of course. Not a great movie, but damn does it entertain..