[Grizzly]

Mechwarrior 2: Ghost Bear's Legacy - the mission where you stand on a jumpship defending it from other mechs whilst preventing massive overheat.
Mercenaries: The solaris missions in both the games.
Mechwarrior 2 itself: The mission where you control a Jade Falcon Mad Dog, infiltrate a Jade Falcon base, take out the reactor coolant, and run the **** away

Oh man, I forgot about that Mech 2 mission. So many great missions in that game.

... I never had Ghost Bear's Legacy. Need to rectify that.

Oh yeah, that one infiltration mission (Cold Crescent)! Normally I cruise in a Firemoth, fly in and out and watch the fireworks.

From Ghost Bear's Legacy, I personally loved "Strike on Moritz" (the one where you basically level a whole city)

Ooh yes, Strike on Moritz was quite fun

I always pick the Mad Dog for Cold Crescent as the mission briefing specifically states it ("We captured a Falcon Mad Dog")

[Lorric]

I found this where someone dissects the Paris level in Twisted Metal 2: World Tour nicely. The Statue of Liberty Easter egg gets thrown in as well. It's also one video in a series of videos on best levels in games which you may be interested in going through.

[watsisname]

Oh ****, Metroid.

Fusion -- the whole thing.  ****ing love Fusion.
Prime 1:  Magmoor, Phendrana, and Phazon Mines.
Prime 2:  Every time you're in the dark world without the dark suit.  And if you're ****ing crazy, getting the light suit without the dark suit, including fighting Boost Guardian.  FFFFFFFF--
Prime 3:  Just kidding, Corruption sucks ass.  Phaaze was kinda cool though.

What else.  Uuum, SSX3 - doing the whole mountain in one go.  Fun ride.

[Colonol Dekker]

I mentioned super earlier. The whole start. The whole end.
Everything in between.


Also fusion.

[Mr. Vega]

I mentioned super earlier. The whole start. The whole end.
Everything in between.


Also fusion.

Lower Brinstar. All of Maridia. The first time you go to the nocturnal habitat and have to face the Ice X Parasites.

[watsisname]

Borderlands 1:  Everything involving Crazy Earl.  And his widdle skag puppy Scrappy. :3
Borderlands 2:  So many great scenes, missions, and quotable characters, but Rising Action is the tops.