Almost the generic fave games topic, but with the stipulation that you give a brief explanation for why each game is in top 5. One game per franchise rule.
1. XCOM 2
The formula of detailed yet fast turn based battles, RNG management and comprehensive strategy layer just can't be found in any other franchise that I know of. It's almost like a genre of its own. MP is awesome too if you can find a game. I'd recommend playing Enemy Unknown/Within first though.
2. Final Fight: Double Impact
In-fighting is perfectly balanced, and is a total riot to play a troll style online. Fantastic netcode and an abundance of players on PSN thanks to PSNow release.
3. Valkyria Chronicles
The best hybrid turn based/real time battle engine around coupled with a charming anime wartime romance story.
4. Chaos: the Battle of Wizards
Like with XCOM, that unique Julian Gollop do-or-die approach to RNG (there are no hit points). Highly nostalgic for me personally.
5. Everybody's Gone to the Rapture
Just so haunting, between the almost photo realistic visuals and sublime music it just generates an unsettling mood all of its own.