Trails of Cold Steel IV is the grand finale of an epic series, which spans over a decade. As with Marvel movies, the more games you've played from the Trails, the better the experience. That's not to say new players won't enjoy it, as it is a good start to the series. The fans, however, would get way more out of it.
For a 15-year-old game, Lost Odyssey still holds up. The graphics may look outdated by today's standards, but the combat system and the story are some of the best from this genre. That alone makes it a must-play for any fan of JRPGs, especially those that have an Xbox of some type. It is made even more accessible through their backward compatibility program. Sadly, there is no other way to experience this gem at the time of writing.
Gears Tactics is the one for both the fans of the classic Gears lore and of the X-COM style tactical gameplay. While some may not enjoy the fast-paced nature of the game, others will find it to be a breath of fresh air. For those that enjoy both - well, they are in for a treat as it is the best of both worlds, which'll leave you craving for more in the future.
Echo Generation is what I would have liked to see from the games based on Stranger Things. But don't let its inspiration for Stranger Things fool you because it is also capable of standing on its two feet alone that I only hope to see more of in the future.