@AhmadMetallic: The AI had issues near launch, they could see you and shot you no matter how well you were hidden. City have since released several patches that greatly improved the AI as well as fixing many other glitches. The PS3 version which came out about a year after the PC and 360 has even more improvements that couldn't be added in a patch. See if you can find a review or updated impressions based on the Patched version. There really is a huge difference between the two.
Don't get me wrong, Sniper was far from a perfect game, it had and still has many problems. If I had to give it a rating I'd would probably only be 6/10, slightly above average. But for what ever reason I just can't help loving the game. The are times when I was playing through the first time I wanted to give up, it was that bad. But then you get to parts where everything comes together and it's just all so glorious. There was obviously a huge amount of passion behind the project.
So I say give it another try. But only if know what you're getting into. It's not the greatest, but if you can look past the flaws and make it through the rough parts, you'll (hopefully) have a lot of fun.