the only Compilation related problem i have is with Dirge of Cerberus, in the cutscenes Vincent does all kinds of awesome acrobatic maneuvers, but when it gets to actual gameplay due to invisible walls he cant even jump over a 2 foot railing... another possible problem for me is the U.S. never got Before Crisis... other than that the original game was awesome, Advent Children Complete is possibly one of the best stories animated so far by SE and Crisis Core was one of the best games to be released on PSP...
id venture to say that most people that didnt like the compilation are the ones that assumed Cloud was this happy quirky personality despite the fact that everyone you meet in Midgar says otherwise, and the compilation shows he was never like that but closer to how Jessie, Biggs, and Wedge describe him early game; cold, withdrawn, introverted...
maybe for me the Compilation is easier to take cause i didnt make Cloud something he wasnt, i played him to the personality given by the other characters in the game and that stayed consistant throughout the compilation...