It's Battlefield 2 or Elder Scrolls Morrowind. Both were the best of their series. BF2 to this day is an amazing game to play, truly a masterpiece of gaming in my opinion that really makes you feel you are apart a of a real epic large scale battle. Morrowind was so immerse, it's insane. It brings an alien world to life, even to this day I found stuff I never saw before the game was that large.