Just played Scar Face last night. It is plesently different from all the GTA type games. It looks like it still uses the GTA engine, but has a better continuity, less random screwing around.
Has some uniqu fetures as well. The "Blind Rage" mode is cool. Also, when you shoot people, it tells you where you hit them (eg. left kindy, right nut etc.) There is a lot of good consistensy from the moive, but you are not replaying the movie. The game starts in the last scene of the movie where Toni sais "Say hello to my little friend". But if you are a little less stoned than Toni was, you don't die, and then re-build his empire.