M
Mjölnir
Guest
RDJ wasn't a draw when they cast him though, he was anything but. Plus the last Sherlock Holmes movie was in 2011, 5 years ago, and those other movies were not mega hits in the slightest. Same with the ones you listed for Evans and Hemsworth. They were moderate hits at best.
On the original point though you can't say Aquaman and WW have been casted poorly based on about 10 seconds and 30 mins screen time respectively. It also doesn't mean anything the actors cast have not been in many hits before.
Well, you can certainly have worries about those castings as Momoa and Gadot has shown themselves in movies before and there are certainly people that call them mediocre, or even poor actors based on that.
From a personal standpoint I'm uncertain if Gadot can carry a movie since she did struggle with some of the few lines she had in BvS, despite not having to show much emotional range. Leading a movie will be more demanding. I never saw Momoa's Conan so I don't know how he fared in that role. I liked him as Khal Drogo, but that was a very silent role in comparison, but I hope for the best as he certainly has the physical attributes.