These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Crowning Moment of Awesome: Pretty much the entire game counts, but there are some especially awesome levels which involve Rubi shooting down a bunch of Mooks while literally jumping from car to car... or gunning down a bunch of people mid-free-fall after being blasted out of a jet.
Let's see, you've just had your plane (not a jet) explode in midair, you're plummeting thousands of feet with assorted burning debris and goons falling with you, what is the best course of action? ... ... ... MIDAIR GUNFIGHT!!!!
Crowning Music of Awesome: More like a Crowning Soundtrack Of Awesome, really. This was actually what they were going for. They succeeded.
Brian LeBarton (the composer): I wanted music that would scare the shit out of you, make you feel like you're in the game. It had to put you on edge and freak your brain out. Face-melting, musical debauchery.
While in an elevator once, Rubi does a kickass harmonica solo.
Goddamned Bats: Blockers. They have to be dispatched via manually aimed headshot, or explosive, or melee, because they'll stand there and block your offhand weapon if you autotarget them. They also hit pretty hard if they get to melee.
That One Level: Every player probably has a different arena level that they hate with a fiery passion. The Icehouse in stage 8 is particularly nasty, being your first meeting with blockers, plus a Leader on the field immediately.
What Could Have Been: A sequel was announced in 2010, but was quietly abandoned in 2011. No announcement thereof was made, but several press agencies noticed a few former employees listing the project on their CV as cancelled.