The best First Person Shooter

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Looks a lot like Halo (to me)
Any upsides and downsides?

It's an absolute classic of the FPS genre and deserves a play based on historical value alone. However, the game is actually very balanced to this day, the music is good and the graphics look surprisingly good considering its age. It has a ton of different game mods as per the Unreal Tournament standard and by far the most interesting one in my opinion is Onslaught which is essentially like Battlefield. You can have up to I think 128 players (perhaps more) who play on opposing sides fighting for control of outposts located on the map. After players have control of all of the enemy outposts the energy core at their base becomes vulnerable so the attack is focused there and if it's destroyed they win, rinse and repeat. It sounds simple but it is actually quite complicated and if the teams are evenly matched games can be incredibly exciting. The vehicles are a lot of fun and especially on the really open maps you can reach insane speeds which is a thrill. There are some glitches that haven't been fixed but these have become a part of the game and are actually quite fun. Overall there are very few downsides, it's an amazing game in my opinion.