The graphic novel style cutscenes and the noir presentation add a lot of atmosphere and charm to the game. While the story is rather simple when you look back at it in retrospect, stuff like the one-liners make it memorable.
Bullet time is a cool mechanic and luckily is balanced enough to where you can't abuse it and the game can be safely beaten without it.
While shooting and moving felt fluid, platforming is poorly implemented and can cause some frustration and a few accidental deaths.
The game's dream sequences also felt a little annoying to play and could've been implemented as cutscenes instead.