Possibly the best singleplayer game ever...
I'll just point out some highlights:
Controls are very easy to get used to
As I mentioned earlier, graphics don't look too bad considering its 6 years old
Incredible storyline - You'll never want to stop because every mission is just as intense as the previous one.
I love hearing the music in this game. I catch myself humming along while I'm playing. Great sound effects too.
Overall, it beats any other mafia-like game out there such as The Godfather.
In my book, it's in the top ten best games of all time.