This is the first Hitman game I have played and I must say, I'm very impressed.
The gameplay in Hitman: Blood Money is apparently pretty similar to the previous games. If that's so, then I definitely want to pick up the other installments in the series. In Hitman, you play as a contract killer, called 47, assigned contracts by a woman named Diana whose face you never see. The objective is to quietly kill the target(s) and try to leave as little evidence at the scene of the crime as possible. Killing people is made extremely fun thanks to a large arsenal of upgradeable weapons, as well as many innovative features such as 'accidents'. In order to appear innocent, you can rig things to fall on targets in order to kill them in a way that appears accidental. However, you can also run in guns blazing if that suits you better. As a plain shooter, Blood Money is great thanks to the powerful weapons. As a stealth game, it's insanely creative and very fun.
Blood Money also sports some impressive visuals, at least on the 360 version. Character models are somewhat cartoony, but realistic nonetheless. Lighting and environments look excellent as does 47. Guns look pretty good, although some could have more detail. This is a vibrant colorful game with many unique environments that are always fun to look at.
The audio in Blood Money is excellent. Voice acting is superb, especially the guy who does 47's voice. The thene music is eery, as it should be, and very well played. Sound effects are good, but they don't stand out at all like the music or the voice acting. All of the music and voice acting in the game really helps to immerse the player in the game.
The replay value of Blood Money is great. Since there are so many ways to eliminate each target, levels can be replayed many times. The notoriety and rating aspects also help to add replay value. The later missions especially are very fun to play through repeatedly.
Hitman: Blood Money is a very fun game, even if you haven't played the other Hitman games. The levels are all inventive and entertaining, the graphics are very good and make for a rich experience, and the levels are so creative and fun, that you can play them again and again. I am seriously considering buying the first three Hitman games and I hope that more Hitman games are released in the future.