It should be a feature film but the right kind of feature film.
The goal should be to make a Superman movie without referring to the following stuff we've seen over and over again:
-- Lex Luthor and General Zod (seriously either Luthor or Zod have been villains of 6 out of 7 Superman movies). There needs to be at least two or three movies before we see either again (and fine with never seeing Zod again). Not a fan of the MCU Spider-Man movies but take a page from that and do a trilogy on under-represented and forgotten villains and build tension before another roll with the big villains.
-- No more origins (we've seen that way too many times).
-- Heat vision (no more scary silhouette of Superman with red-eyed dots).
-- Jokes about turning back time and so on.
-- Enough angst cbout why Superman can't have sex and so on...ixnay on the Christopher Reeve monk approach to superheroism.
I think it can be done. Make a movie centered around Superman as a character, not Superman the folk icon, not Superman the weird sorta-smart-but-actually-dumb philosophizing you see infect anything from Kill Bill to Mark Waid. Make Superman and Clark work as characters first and foremost.