Less than half the games are even good, only three are incredible.
FF was incredible for its time. FFIII is good. FFIV was incredible for its time. FFVI is incredible. FFVII is revolutionary. FFIX is fantastic. FFX is fantastic. FFXI is fantastic. FFXII is great.
The only controversial ones are II, VIII and XIII, and only II is debatable in terms of whether it's a truly bad/mediocre game or not. --- "Dyin' is easy. It's the livin' that's hard..." Grim Reaper, Maximo vs. The Army of Zin