One of my all-time favorite PC-games, and a masterpiece overall. Back when arena shooters were a thing, this is definitely the highest quality game you can ever get, and it holds up well even today.
The fact that its AI is still considered one of the best, and people still play it is truly a testament to its greatness and its long-lasting legacy.
I mean cmon, it has fast-paced action, great weapons, many maps, epic vehicle combat(!), a well-done singleplayer campaign with intelligent bots, extreme moddability and great soundtrack!