Congratulations on naming the three worst Final Fantasy games in your opening post!
FF9 is a bad game. I will admit it offers a fair dose of charm and interesting characters, but I have trouble understanding how any of these could help being up the fundamentally broken and slow battle system and dull growth system. I can understand if someone would prefer watching a speed run or let's play of FF9 to any other, but not actually playing it. At that point you are doing a disservice to the art that is game design.
12 is just a clusterfuck of bad and as I have said before, calling Tactics your favorite FF is like saying your favorite fruit is the tomato. Just because you are technically correct in being able to do so does not excuse you from your madness.
I've played a lot of bad games in my time, and it really doesn't describe IX and XII very well. 'Flawed', maybe.
At the time I played FFIX, I adored it, as I was used to slow PAL games and lengthy summon animations and battle load times. Replaying it, I now find it very, very slow, but 'bad'? Not at all.
Personally I love the characters, particularly Zidane, Vivi, Steiner and Freya. It was so pleasant to go from the teen angst of Squall back to upbeat adventuring again, and even then the inate sadness of Vivi and Freya's storylines made me really feel for them.
As for FFXII, it's a game with lots of options. I chose to limit myself a bit with the gambits and had a blast. My biggest complaint was that Vaan and Penelo add sod-all to the storyline and their motivation (we want be sky pirates!) is pretty much solved the minute they meet Balthier. You could remove both of them (and Fran for that matter), begin the game as Ashe on the run, and you wouldn't miss anything. I suppose, being purposeless characters, they give a reason to go on monster hunts etc, whereas Ashe and Basch are the only ones with a reason to pursue the plot.
I have a hard time narrowing down the FF games, I can just about put them into the camps of the ones I really like (IV, VI, VII, IX, X, XII) and the ones I don't (I-III, V, VIII, XIII). That's one of the strengths of the series for me, they change it up often enough that even when I don't get on with an entry, the next one will probably change what I dislike. The only problem for me was when they doubled down for years on Lightning and her cohorts, it's been 8 years since the last one I enjoyed at this point, unless you count the X remaster or Bravely Default.