I've been thinking about the young Han Solo movie that Disney has coming up in 2018 and I can think of a few ways that could turn out good, or at least entertaining. I'd really like for it to really explore the dark underbelly of the Star Wars universe that we've really only had a glimpse of so far: bounty hunters, rough and tumble outpost cantinas, crime lords, and smuggling. There's definitely a lot of room to play around with some cool locations and weird characters, maybe have it either be some sort of swashbuckling high-seas pirate adventure set in space or a scifi heist movie. Hopefully they don't try to play it really safe and have it be just some straight-forward, a-to-b checklist of Han's life story, though I kinda think that's exactly what they'll do.
Edit: But with Phil Lord and Christopher Miller directing, I have some hope.
The funny thing is that in the first movie they do a bunch of implying that Han isn't necessarily to be trusted, only cares about the skrilla and he's only a temporary ally because that's no moon. Then suddenly he's totally on board with the rebellion, while continuously saying he's only around until [X]. Even with the hamfisted Leia subplot.
And for all the discussion of that seedy underbelly we get Vader in a room with a bunch of bounty hunters and then Jabba's palace. Most of the rest of those type of characters only got any fleshing in the EU. (Actually, we got to see a bit more of it in the prequels in II. When they show the lower seedy sections of Coruscant.)
A Han movie does need to be like a heist double-crossing everybody type deal gone bad film written first.
Then you splash Star Wars and Han over the top.
Could even do something ala Ocean's Eleven (I've always wanted sequels to that remake) and like fifty thousand other films where they don't reveal Han and Chewie's gambit until the end where they had the whole thing under control after everything seemingly to go wrong for the previous half hour. Since you have to make Han a kind of god for a lot of the fans.
Also, he can shoot somebody right away in like the first two minutes of the film. (And ideally, have it backfire by having him kill someone that would have prevented the entire deal from having gone wrong, etc.)