Mechwarrior 1, 2, 2:Mercenaries, 3, 3:Pirates Moon, 4:Vengeance, 4:Mercenaries, 4:Black Knight
In other words, Mechwarrior has the coolest most badassery video game movies.
For example, the MW3 intro - a panoramic of a ruined battlefield... retreating forces crest the hill and light mechs get cut down by an unknown foe's PPC. Radio chatter is getting more frantic, and out of the smoke and haze come both a Thor and a MadCat. They get closer to the city and you see targetting perspectives from inside a Vulture hidden in a ruined building, scanning the targets. The Thor and the MadCat break group and head different ways... shortly after the Thor begins pulverizing the city, the MadCat gets a face full of Gladiator Pwn.
TBH I thought the Brood War one was a little too haphazardly put together. It was like 30 random-ass short cuts of battle thrown together, 3 minutes of actual plot, a marine using a gun that doesn't even exist in-game, and more random footage.
Actually something that really annoyed me about the SC movies was that they seemed to be made by people that never even played the actual game. According to the Starcraft movies, Marines aim as well as Stormtroopers and Zerglings are covered with 8 inches of steel plate. Seriously, if you can't even the continuity right in your MOVIES...