The most notable thing I can say about Final Fantasy Tactics Advance so far is that it's put me to sleep about 7 times so far.
The intro to the game goes for at least 30 minutes before you can save the game, and closer to an hour if you're a slower reader. The first time I played the game, I fell asleep before I could save it. The second time, I got to save the game, but when I started the third time, I couldn't remember anything so had to go through the intro a third time before anything stuck. Variants on the same thing happened several times after that, where I'd fall asleep in the middle of a mission or forget what I was supposed to be doing, and just had to restart from the last saved game.
In addition to the slow pace of the game, there are a few other issues with the game. You're rather suddenly dropped into things with a fairly steep learning curve, and this isn't helped by the fact that equipment interfaces leave a lot to be desired. When shopping for equipment, you're only told what jobs can use that equipment, meaning you have to remember what jobs all of your characters have. Worse, when you're shopping, you can't tell if any given piece of equipment will improve your character's stats. And when you're actually equipping items, you also can't tell if the stats are improved -- the only way to tell is to note your original stats, swap items, and then see if they improved.
But, this isn't nearly as damning as it might sound. All those times I fell asleep, I was admittedly pretty tired, and playing right before bed. And the interface problems -- while annoying -- can be worked around without too much effort. Regardless, that doesn't change the fact that this game is not for the casual gamer -- anyone interested in this game is going to need to invest a lot of time reading things and learning the intricacies of the gameplay. If you're a fan of Final Fantasy and strategy games, check this out. Otherwise, I'd steer clear.