I've been a big fan of Tom Clancy's Ghost Recon since 486 computers were the dominating force in the PC world and played my first Ghost Recon game which I became instantly hooked.
Fast forward to the Ghost Recon: Future Soldier (and perhaps the last great title, which I haven't played yet the latest Ghost Recon Breakpoint) I would say out of "10" rating best, I would give it a solid "9."
Besides it's great graphics, it was it's game mechanics: the cover system, going from a 3rd person perspective into a single when looking into your rifle scope, crouching, or just laying downing when firing, hand-to-hand combat, switching from one side to the other side (left to right or vise versa) when aiming: made the player so much involved into the game. I just wish that game designers would pay attention, if not take notes from these game designers..