So I should get the other Farcry games then? I only ever played 3 and didn't beat it. I had a lot of fun with it though. Currently geeking out on the Reaper of Souls edition of Diablo III. Got it Friday and I'm fighting the urge to go straight to act V with every bit of my willpower.
Get 4 and Blood Dragon, as both are superb. 1 and 2 are different beasts with some design choices that made the game harder, or simply more-frustrating to play. 1 is a more-linear actiony-style game that eventually gets sci-fi mutants added to the enemy list, plus a fight in a volcano, like all good B-movie baddies.
The best way to describe 2 is that it is, essentially a 'proto' open world; gallivanting around and searching for diamonds to beef up your weapons and similar is hilariously important, as you probably know, but the save system needed a kick in the posterior (can only save when fast-traveling, or at a safe-house, so if you spent 6 hours collecting diamonds, then fall off a clif and go splat, welcome to 'redo' town), some enemy spawns were gratuitously annoying with their frequency of trying to run you over with a truck, major plot points could be lost due to a glitch that would end up with you not being able to listen to 8 of the 18 hidden tapes that detail the motivation of the person you were hired to put a bullet into, and, when all's said and done, It's still fun as hell, despite the flaws.
The fact that you're essentially Kurtz from Heart of Darkness, in that you're doing what you do to screw everyone as hard as is humanly possible, is also a fun little twist on the premise.
Each of the four (and a half) games has its own seperation, so you don't have to play through each one in order to understand the next; all the 'callbacks' are subtle, mostly via enemy loot, and, in the above-mentioned Warlord's case, the only context he gives you is that he was baptized in a specific waterfall that you explore around in FC2.