Really awesome game, kudos! Just beat it now... played it around four or five times over the last few weeks. Very fun, you get a real feeling of satisfaction once you realize how it all works, in what order to do stuff and what timing, etc. 5.
So yeah, I started off grimacing at the cliched stories and and easy mission, but once you keep playing this game really draws you in. Yes, it's stupidly over-the-top, particularly the storyline... but it's all part of the film-noir feel of the game. I wish it had a little more gameplay though, but the last set of missions were good.