Originally Posted by
Sutekh
To really go with the Thunderbolts theme, it would make sense to build the cinematic Thunderbolts out of villains we've already seen in the Marvel cinematic universe.
That said, movies tend to kill off their villains, or otherwise render them unusable for this sort of story-arc. Obadiah Stane's dead. Ivan Vanko is dead. Killian is dead. Mandarin wasn't real. Malekith and Kurse are dead (and neither they nor Loki would really work on a Thunderbolts team, and other Thor villains who might, like the Enchantress and Executioner, haven't been introduced).
The only surviving bad-guy from the Cap, Thor, Iron Man and Avengers movies thus far is Frank Grillo, who isn't even Crossbones yet anyway... Add the Abomination, from one of the Hulk movies, I suppose.
While I would very much prefer the original Thunderbolts; Songbird, Moonstone, Fixer, Atlas, etc., they haven't been introduced as villains in the cinematic universe, and so the entire premise of them being former villains is kind of empty. "Ooh, these new heroes are actually people you've never heard of that apparently have criminal records! Woo!"
Agents of SHIELD, being written as a serial storyline (like comic books themselves), is doing a better job of not murdering off all of it's villains, and leaving behind a few characters suitable for a Thunderbolts style storyline, with characters like Deathlok and Lorelei.