Famke aged out a while ago, but what's wrong with Jai Courtney? I know he's been in a lot of crap but he's usually a bit part. I thought he was good in spartacus. He's certainly not toxic like Leto.
Some actors are a kiss of death, they were in a at least one good thing but, and really through no fault of their own, they end up being in a lot of fucking garbage. Famke Jensen and Jai Courtney are two of those actors,
Edgar Ramirez is another one. There are a couple more but I can't remember their names right now.
Basically when you see one of these actors in something it's either going to be shit and bomb or it's going to be at-best-'okay' and still bomb.
I, personally, don't think Jared Leto being attached to He-Man is what hurt the box office (not significantly but he sure as hell didn't help), the fact that it was He-Man did. He-Man was a joke you watched between Transformers and GI Joe. You watched it with blocks of other cartoons like Inspector Gadget, Gem and The Holograms, Gummi Bears, and other shows like that. Everyone I knew that had He-Man toys got them because a relative saw them in the budget bin and thought it would make a nice and inexpensive gift.
They should have remembered who their audience is, not who they want them to be, and went hard fucking R with it and had blood and destruction, a lot of near but no actual nudity, and then ended it was a totally out of place morality lesson. End credit scene is Skeletor laughing and saying he'll be back. Or, instead of a movie, 10 30minute episodes that totally ape, in hard R, the original cartoons and include the morality lesson.
I dunno, I just never thought the movie was going to succeed because no one really gives a shit about He-Man.