I tried to get into Splatoon on the Wii U, but just couldn't do it. FPS games have never been my thing, and even though this is team 3rd person shooter type, I'm more of an RPG guy.
As for Monster Hunter, God Eater is considerd a Monster Hunter clone similar to games trying to ride the coat tails in the Soulsborn genre. It's slower paced than the God Eater games, but you have to use a ton more strategy and planning in your fights. Like in the Dark Souls games, when fighting big hunts it's all about positioning, pattern recognition, and not getting greedy with your attacks. The crafting and stat boost system is one of the best on the market.
I prefer playing Monster Hunter solo because you get to learn all of the ins and outs of the boss fights where multiplayer can turn into a spam fest, but when farming for rare materials I like to play multiplayer to speed item drops up. When playing solo you can gather little cat followers that boost your stats, can heal you, and add some extra attack muscle.