As much as I like Superhero movies, I think a lot of stories would be better adapted to HBO style miniseries. One hour episode with anywhere between 6-13 episodes in a season. Punisher Max would be perfect in this format. As would a vast space epic like the Annhilatiion War.
Likewise some characters would be great with tv shows, I'd rather see She-Hulk in something written by David E. Kelly (especially now that Wonderwoman has flopped). Add Doc Samson and a lot of 4th wall breaing and it could be brilliant.
But movie wise lets see, from Marvel:
Doctor Strange - directed by Guillermo del Toro who can pack it full of magical weird stuff, with Patrick Dempsey as strange, he wants the role badly and has played a highly strung neuro-surgeon before on gray's anatomy, is around Strange's age and all he needs is a moustache. This move will probably draw the female crowd too, which would always help.
Heroes for Hire - with Luke Cage and Iron Fist, I get worried because I keep hearing about possible solo films for these characters. That's a stupid move, these two become far more entertaining when playing off each other in the whole Blackpoitation meets White Ninja thing. Isiah Mustafa wants to play cage and well he is built and hillarious so it might work. Ray Park wants to be Iron Fist, I think that might work, though he's not getting any younger, for Danny Rand you need some who can do kung fu while being a funny billonaire
Black Panther - Might work, need to get the vibe of Wakanda congruent with the Avengers movie and have a good African actor play him, Djimon Hounsou has been talking how he wants the role (though I don't actually believe he knows much about the character), but he might be pretty good. Have to establish though that he isn't just Batman from Africa, he gets powers and strength from the herb he applies to his skin and can use vibranium to make cool energy daggers and stuff.
Lets see DC:
Hitman - Comedy deconstruction of 90's anti-heroes, pretty violent and hillarious. Runs the risk of being diluted into a generic action movie though (with Keanu Reeves) and that must be avoided at all costs, keep the superhero setting and even the fact it's in Gotham, hell even sneak a cameo from Superman in the middle of the movie (like what happens in the comics and he's sitting on a roof worrying about the man he couldn't save) might even be the thing that kicks Tommy into being a hero albeit briefly.
Animal Man - Washed up superhero with vague powers gets back into the game, doesn't expect his own world to be turned upside down. Hell a whole bit at the end where Grant Morrison actually appears in the film would be brilliant to explain that Buddy is in a superhero movie and how he created his story. The ending would be just as touching as the comics.
Misc:
The Boys - This is a given, can be shortened and adapted quite easily, Clive Owen (or Gerad Butler they're pretty much interchangeable) as Butcher, Simon Pegg as Wee Hughie, Jean Reno as Frenchie, not sure about Mother's Milk and The Female, a brief but monolithically awesome appearance with Clint Eastwood as Mallory, though he probably wouldn't go for that, so some other old-badass.
Can't really think of anything else that isn't a Mark Millar story and f*** that guy, he doesn't do comics anymore just movie ideas.