I'll go with Shadowrun. Without a doubt the best mulitplayer FPS I have played in years. The game got shit on since it was MS's pet for their PC-Console shit. And people threw out the notion is could be decent.
Turned out it was fantastic in all regards. I can't think of a game with better balance todate. No class ran the same speed, Had the same health/magic, special ability, etc. And how every power/tech had a fantastic use for it.
Like for instance, Gust. Gust if could break your fall if you timed it right, knock enemies off the ledge, Could use it as an extra boost with the glider, only thing that could affect a smoked character, knock grenades back at the enemy, and more.
Or how teleport complimented using the blade. A common tactic was to get a bull character. The more you shoot them, the less damage they take. They harden under constant fire. And then get the tree of health to constantly heal. But if you got behind them and hit them with the blade, they get a bleed out and it doesn't stop. So now they are forced to be by that tree at all times. They can't move around unless they can plant a new one. While at the same time if someone had the resurrection spell, They could heal the bleed. But that also leads to something about resurrection, where if the resurrector dies. Then anyone he rezzed will start to bleed out.
There was so much of this little stuff, yet everything was surprisingly well thought out and completely balanced. Not a single level was fantastic, Not a single gun was overpowered, and more.