Hulk had already had a movie and a popular TV show. The Incredible Hulk cribbed from the TV show's intro to summarize Banner's transformation. It's easy to skim the origin when the popular culture already has absorbed the gist of it.
I'm sure the origins of Doctor Strange could have been summarized better, and probably would have benefited from it. I found his development from scientist to sorcerer to be too quick and unconvincing. Starting the film with an already established Dr. Strange might've worked better, but as an introduction into the mystical side of the MCU, it was necessary that at least one of the characters be a novice to sorcery. Maybe Stephen Strange wasn't the right character for that, but then, the novice would like have become the main character, rather than Strange.
I'm sure Captain Marvel's will be handled deftly (though just from Driver's summary it still strikes me as needing some important details - Who is the alien? Why is the alien on Earth? Is Carol Danvers aware the alien is an alien? Is SHIELD aware of the alien?). If it is going to be a 1990s period piece, though, can we count on the alien technology that is already pervasive in the post-Chitauri MCU? I presume SHIELD would be the MCU's version of the Men in Black, controlling access to extraterrestrials and their technology. What do we currently know of alien visitation to Earth in the MCU, other than Yondu's quick visit to nab Quill in the late '80s?
I get it, though. Superhero origin stories are the largely the same, and have become boring. However, I'd like to point out that Batman, of all characters, got an entire origin movie in 2005, despite not really needing one, yet it still covered unfamiliar territory for a familiar character.