I bought K&L2 with a degree of trepidation after reading some positive reviews and some lukewarm reviews. I have to say however, I was pleasantly surprised at how good it is. Whilst it is a short game in single player it isnt too short and the fun you have whilst playing compensates.
The visual style is like nothing Ive seen before and very much like watching he action through a handycam or the like with the light flare and judder when running - but it adds to the sleazy seedy atmosphere of the game and sets these two grimy criminals in an environment that suits them.
I found the gunplay to be excellent fun and having to switch between weapons for different scenarios a nice touch.
All in all, it is rare I pick up a game and play it through to conclusion with little interruption, but this was one of them. The last one I did that with was Uncharted 2, and whilst not up to the there in the quality stakes like that game, it has an addictive edge that just kept me coming back for more.
Buy it if you can get it for under 20 pounds, I dont think you will regret it.