NOTE: this is a review of the game itself, not the GOG release. Basically, GTA3: Mobster Edition with an extremely heavy emphasis on story (which is good but, or maybe because, it is ripped off almost wholesale from a certain well-known film) and fewer penis jokes. The gameplay is fairly standard early 2000s TPS fare, meaning no health regen and no snapping to walls. The driving deserves more attention as it is decidedly less arcadey than GTA's (even today), even including (optional) manual transmission (!) and speedometer (!). In fact, the driving model is so complex (at least by casual, non-racing simulator standards), that one mandatory story mission that requires you to win a race (old-timey wheeled cigar style cars of course - goggles required) actually includes a semi-hidden shortcut that allows you to win without any effort. Other improvements in the "auto" department over Grand Theft Auto include passengers taking damage from collisions (!) and freelook shooting while driving (!!), the latter being understandably slightly hampered by being limited to pistols. It took Rockstar 6 years to include these features in GTAIV. Also, unlike any GTA game or clone before or after, the police fine you for breaking the speed limit or running red lights (!!!). As said before, the "meat" of the game is the mission based story mode which is pretty well done. There is a bare-bones "open world" mode that was included almost as an afterthought and an unlockable "extreme open world" mode which the developers poured all the pent-up GTA (more like Saints Row, anachronistically enough) zaniness into. To summarize: if you ever 100%ed a GTA game and enjoyed doing so, you will probably find Mafia too limiting. For everyone else, it's a must-try.
Don't know exactly why fanboys of the first game dislike IW. Because it made a mockery of the ridiculous dial-an-ending, making all 3 canon? Because ammunition is now universal (sounds pretty cyberpunk to me)? Because JC Denton is now "evil"?