Which Square games' stories have the best and worst third act?

I was looking at this week-old thread and saw a small comment chain talking about Square games' third acts:

Square and fumbling the third act—name a more iconic duo.

While I do tend to agree (and not just Square games, many JRPGs in general), I was wondering what you all thought about those games' stories third acts. Which are some of the worst ones, some of the best ones, some common trends. Or just your thoughts about this.