Trove is a fun action-y MMORPG, not quite to the scale of WoW but not too far off. If you're wanting a nice single-player experience without too much story, I legitimately enjoy ARK: Survival Evolved. Yeah, it's technically survival crafting, but it's mechanics are straight out of any western RPG and you don't need to play with anyone else. Biggest downside is because it's so poorly optimized it's like a 100+ gb download with all DLC.