I think you misunderstand how Rotten Tomatoes works. Wonder Woman and The Dark Knight both have 94%, because it means out of 100 people, 94 would say it's worth watching. But if you look at the average rating, it's 7.6 for Wonder Woman and 8.6 for The Dark Knight. It's also lower than Logan and Iron Man. And rightfully even with Winter Soldier; and if you think that's a spy movie, what's surprising about Wonder Woman being seen as a war movie.
I'm talking more just about the quotes and praise I see here ("One of the best superhero movies ever.......easily in my top 5.......9/10").....not specifically Rottenwatch.
Wonder Woman is a war movie in the same way that Rogue One is a war movie. They kinda ape some conventions of the genre in a superficial way ("Let's assemble a ragtag team of misfits to go behind enemy lines...") but don't really go beyond that. The lack of attention paid to supporting cast makes WW feel much more like a superhero movie during wartime, and not a war movie.