Moviebattles 2 for Jedi Knight 3: Jedi Academy
ONLY multiplayer team vs team online 5 minute matches on maps w/objectives. The team/community has modeled basically every significant SW character and set piece from all the films.
The only point of this mod is to make a game that plays as much like a Star Wars battle scene from the films as possible.
Each team has different characters available to play from the other team, with slight correspondences (i.e. the Reb team 'Hero' and Imp team 'Bounty Hunter' characters are essentially equivalent in role, but differ in specific capabilities). Once a character type has been selected by the player, you buy abilities for that character from a fixed pool of points. You can save your selections as presets.
You can play a Droideka. You can be a Mandalorian with jetpack, flamethrower, wrist blaster, EE-3 (Boba) or Westars (Jango). It's first or third person perspective, and they modded the first person perspective to move with the character.
The entire sabering system has been overhauled from the basic JKA game so that it's no longer even a close comparison. You have to manually block and position your saber to counter an opponent's saber. There's force powers. You can wield a single saber, dual sabers, or staff sabers (i.e. MAUL).
Honestly, it's generally just balls-out, no holds barred, action action action packaged in 5 minute rounds. Max server cap. is 16 vs 16. Playing an MB2 map with 16 vs 16 is extremely intense, especially if every player is actually trying to play well.
The learning curve is steep and the skill cap is really high. I've been playing MB2 for about 6 years now and I'm still not sick of it, it's my go-to "quick fun" game.
You just have to buy the JKA game (for like $5 online, steam or GOG) and download/unpack the mod files. If you buy the Steam version, you don't also have to install the one and only official game patch (maybe the GOG version has this too now, it didn't used to).
http://www.moviebattles.com/
http://en.wikipedia.org/wiki/Movie_BattlesScreenshots and Youtube vids don't do it justice by a long shot, the beauty is in the gameplay, you just have to experience it firsthand.