Yep I have. Ultra Moon was incredibly easy. Beat it in two weeks flat. I only ever had a couple hickups (Hawlucha being too overleveled, the Totem Mimikyu boss, Totem Togedemaru's Dedenne Ally, and a few other things). It's nowhere near as hard as you're stating, I beat the game with a Ledian on my team. A Ledian. And it was useful. Trainers and bosses were ridiculously easy for the most part, the game was super linear, and so on. Overall, one of the easiest games I've played. And don't get me started on Rainbow Rocket. Thought it was gonna be actually hard, turned out to be as easy as the rest of the game. The leaders were pathetically easy, they were destroyed by the smallest touch. Only issue I had was my Sylveon not KOing Reshiram with Twinkle Tackle because I forgot how typings worked for a moment. Overall, the game was easy, and if what I've heard about XY and ORAS is true, then we haven't had an actually challenging game where you earn things for yourself and explore for yourself since BW2.