FFI
+ replayability
- scarce money

FFII
+ dark, memorable atmosphere
- unintuitive leveling (though it gets props for being original)

FFIII
+ interesting villain
- you never get an airship that lets you freely fly over everything

FFIV
+ five-member parties
- fake-out deaths

FFIV: The After Years
+ so many characters
- plot relies on referencing FFIV too much

FFV
+ awesome job system
- last world could have used a bit more plot

FFVI
+ amazingly dark atmosphere with lots of mood whiplash
- the "anyone can be saying this" lines

FFVII
+ probably Uematsu's best soundtrack, though tied with VI
- materia take super long to master

Dirge of Cerberus
+ seeing Cloud, Tifa and Barrett for those 30 seconds or so
- the dumbest plot in the entire smurfing series

Crisis Core
+ Zack and Aerith fluff!
- smurfing Genesis

FFVIII
+ Squall
- "actually, we all grew up together, remember?"

FFIX
+ throwback Thursday
- slow combat

FFX
+ Masashi Hamauzu's music
- blitzball

FFX-2
+ fun and light tone
- why do I only get AP for actions?

FFXI
+ big fun world
- I only got to play this for two weeks

FFXII
+ gambits were a revolutionary concept and designing your own AI scripts in detail was engaging and strategic
- long periods without any plot cutscenes

FFXIII
+ graphics and music
- ughhhhhh

FFT
+ best job system in the series
- huge difficulty spikes unless you grind a lot

FFTA
+ amazingly executed story - my favorite in the series
- repetitive quests

FFTA2
+ vastly improved gameplay with more races, jobs, and more varied quests
-main story is severely lacking