It's fun to shoot people in this game, but that's all there is to it.
However once you acquire some decent weapons, the game loses this approach and turns into a shooting galore. You'll find a thug wanting to kill you at almost every turn, which gets a bit tiring after a while. Sometimes you wish you could do something else than shoot all those thugs.
A problem in this game is difficulty. For a newbie - like myself - at Kingpin, I found the first level to be very hard on just the Medium skill, so I played it through on Novice. However, then the rest of the game became too easy. The final bossfight was a breeze. Still, the game does have a few fun innovations, such as being able to recruit thugs (which are actually a big help, contrary to many other shooters where they just get in the way) and the ability to rob (dead) people of their money, to buy things at your nearest Pawn-O-Matic.
All in all, this game is not too bad - The gameplay is nothing new, but it's short enough to not make it overly tiresome. When the feeling "What, that's all there is?" has gone away, you'll realize it's still a fun action-packed game. If you can get it for less than a buck don't hesitate to try it.