If you just want to experience them, then sure.
If you're actually looking for a fun game to play, then don't bother.
I actually have played through most of the series in the past two years (I only have Primal, New Dawn, and 6 to play now) and you've already played the best of those which is 3.
2 is basically the precursor to the modern open-world game, but because it's basically the originator of the formula, it's missing a lot of Quality of Life improvements that later games made. The story in 2 is DULL. Exploring the map is also pretty boring, though the African setting can at times be very cool (I particularly like it when it's raining), and you can't really do anything or go anywhere without getting into a firefight. Every mission will literally have you drive from one corner of the map to the other, while constantly having to get out of your vehicle and shoot back at spawned enemy attackers then get back in and drive a little more before getting out again to kill more attackers. It's very tedious.
I think people who say it's the best like the idea behind the things that the game does well so much that they ignore all of the things that seriously hold it back.
If you do play 1, I would recommend Far Cry Instincts Predator, on the 360 or Series X via backward compatibility.