She's always had mythological foes, the ones cribbed from mythology tend to be her best ones. The original rogues tend to be the not so inspiring, which is sad because she's an original character. Not all of them are so
bad but many of them(Dr. Poison, Dr. Psycho, The Baroness) aren't actually able to physically challenge her. Giganta and the Queen of Fables have weird origins that would take more explaining on top of Wonder Woman's. Silver Swan's was messed up by the crisis(and is heroic anyway
. Hollywood historically has problems moral ambiguity). Cottus would just be plain hard to do in live action.
What's that, Ironman 2 and Blade 2 just made a new nemesis for the sake of the film? Yeah, but usually Hollywood is only doing comic book movies to decrease the amount of original work they have to do and even new ones can fall flat(Cat Woman). So just crib one for mythology? Okay but that leaves other problems.
There is a strange trend for writers to shy away from her unique traits. Hellenistic golems can be counted on one hand, yet, that she is one pretty much only brought up when talking about Wonder Woman's origin and is usually implied to be false, such as when the DCU implied she was Hades's bastard child and DC retconned it outright, never mind the bastard born half human hybrid plot has been done as far back as Asmodeus and her current origin is the same as Xena
The outfit is not easy to use in live action but Lynda Carter made it work so everyone else seems to think they can too(including stunts Carter never did because of the thing's limitations), instead of just going with one of Wonder Woman's more practical outfits and leaving the "iconic hot pants and bustier" to a mythology gag.
A two meter plus athlete who settled on an acting career isn't easy to find
. Especially when a lot of casters, for whatever reason, avoid women taller than their man leads, discouraging those who otherwise would aspire to act. Chyna came close enough that they could easily hide the two inch lift to make her six foot but WWE was probably sabotaging her chances if she had any.