I’d have zero interest in a Darth Vader movie no matter who was involved.
You just never know. When they first announced The Mandalorian, my interest was low. I thought it would be something I watched while waiting for the next movie or a series I was more interested in. Now it’s become one of my favorite Star Wars things ever.
If someone writes a compelling story with interesting characters, people will enjoy it. If it relies on just the presence of Darth Vader, then probably not so much.
Vader is synonymous with all things Star Wars, but other than a few brief cameos, we’ve only really seen Vader in the Original Trilogy. I’d like to see a little more Vader with modern film making.
I’d be interested in the time directly after RotS, way before Rebels and even before Fallen Order. There’s so much discovery going on during this time. People would be just beginning to see exactly what life under Palpatine’s new Empire is like. Any surviving Jedi or Padawans would just be figuring out the breadth of Order 66 and what they should do next. Vader of course is just embracing all he has done and what his new role is.
The Separatists have been wiped out, and the Rebellion isn’t even close to forming. The Inquisitors wouldn’t be a thing yet either, so Vader would be the main villain, not the cameo role he’s been in since the OT.
I think it could work, either a movie or a short 4 or 6 episode mini-series. Again, like anything else it would depend upon the writing and not relying on just the appearance of Vader as the appeal.