Advent Children was a huge disappointment after being built up so much. After playing Final Fantasy VII though 8 times, i was expecting more deep story telling and in depth character building.
The loose plot, confusing dialogue, lack of explaination (tseng and elena showing up at the last minute to save rufus for example), lack of materia and ultima, hard to follow battle scenes, and Sephiroth only being alive for 5 minutes of the movie... (kadaj? Where the hell did he come from and why did he turn into sephiroth?). Its just too sketchy and falls apart next to the genius of FFVII.
Sure it was pretty... and Rude and Reno... AWESOME. but for