Far Cry has been a fun series. 3 and 4 are definitely worth playing. Personally, I don't think I'd go back any further than that. Far Cry Primal sucks, don't bother with that one.
Fun weapons. Fun vehicles. Lots of different ways to complete the missions. You can go in stealthy and surprise kill everybody and silently disarm the alarms that will call in more troops/helicopters/etc. Or you can hop in a truck with a heavy gun on top, skid into the enemy camp guns blazing and mass murder fools.
You'd probably be fine starting off with FC5. But if you're bored, 3 and 4 definitely are worth a play.
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