Let me start off by saying that i know GF3 is not as good as the first 2.
In saying that....
I still like it. I find it completed the trilogy very nicely. I know alot of people bag on George Hamilton, but let's be honest, he's barely in the movie. I can think of two scenes he's in, that's it. I'm not touching Sophia, because that horse has been beaten to death. Without the third we wouldn't have gotten the wonder performance by Andy Garcia. Vincent Mancini was a great character, full of passion and aggression. I love the scene where Michael transfers power over to Vinny.