FFX was my first and still the best IMO. The characters are great, the story and pacing were perfectly done (especially for someone who had never played an RPG before, as you're pretty much in the same boat as the main character for not understanding the world you've been thrown into), the combat is one of the best turn based systems ever devised and there's a shit ton of miniquests and optional bosses to sink 100+ hours into. I've recently been playing it again with the intention of finally doing a "perfect" run through, where I will complete everything and aquire every item/weapon and level my characters to the absolute max.
X-2 Was ok. In retospect I would have preferred X to have been left alone where it ended, but X-2s perfect ending is at least satisfactory, the combat is good and the story is mostly alright. Not great, but it didn't completely ruin one of my favourite games of all time, so I can live with it.
Of the others, 12 started really well, but then rapidly descended into tedium and hatred for me. I could literally rant for a good long while on all the things that annoyed me with that game, but I'll spare you the details and suffice to say, at some point EVERYTHING pissed me off.
I quite liked 13 though strangely. I was really excited about it when I first heard about it, but then my interest declined as time went on, until the point where I nearly never bought it. When I actually did play it though it wasn't all that bad. Yes it's linear (but so was X, most of 12, large portions of 7 and 8...) and the first few hours you have no idea what's going on and have to read the codexes, but it does get better, the combat is good and most of the characters become less annoying over time. Snow can still fuck right off though.
