FATE/Extella: It's really fun, if you like these kinds of games, then it's totally worth it, the story is also really cool if you're a fan of the Fate series, however, if you don't like the Musou style gameplay then that may be an issue.
Fate/Grand Order: Translation issues aside (and those are getting fixed soon) it's a fun mobile game, gameplay is simple and easy to understand, but servant attributes and skills open it for interesting strategies. Also, though the gacha is hell, and you probably won't get any of those 4-5 star characters you want, the good news is that even low-rarity characters are enough to clear most areas in the game, and since they can be ascended (increase their level cap) even the weakest ones can become quite strong if you invest some time/resources in them.
Ghost Recon Wildlands: Though Ubisoft needs to tone it down with the side-missions (or add better rewards) it's still a fun game, The environments are pretty cool, missions are fun (most of the time) and using the drone to scout an area before calling in a mortar stike never gets old. It does have some issues, but I would still recommend it.