The Godfather Part 3 - whats your opinion ?

[zombie63]

I sat down to watch the trilogy again a few days ago ,As I often do when stumped for choice (If in doubt - pull the biggy out). Now I will always watch all 3 , you just have too , but my question here is not about the first 2 films which are flawless IMO , its about Part 3.
Now dont get me wrong I do like the film , but it has one major problem IMO which kind of ruins it from standing along side its 2 predecessors.

Sofia Coppolas performance - I do understand that Francis Ford was under huge pressure to cast a big name in the part of Mary and problems with actresses being locked into other projects seemed to make it difficult for him to choose a suitable actress to play her - but casting his daughter in this part was for for me , a monumental mistake.
Now I know many critics have said that her performance brought a air of innoncence and vulnerability to the part , but for me in the 'heavy' scenes I find it hard to watch and cringe with embarrasment at her performance.
I know Winona Ryder was linked to the film at one point and to be quite honest I dont know if even she could have pulled it off.
My favourite scenes are Michaels confession to the priest and the opera finale which are both beautifully handled.
So c,mon everyone get it off your chest - Whats your opinion ?