If Battles are what you want then you'll be very well pleased.  Final Fantasy Tactics gives you the opportunity to use the job system like in Final Fantasy V, allowing you to create customized character that can use magic, and summon creatures, etc.  All of the classic job classes are present in the game, along with a few others that only certain characters can posses.  The classics like black mage, white mage, summoner, knight, monk, etc. are very common, but there are a few other classes such as engineer, holy knight, dark knight, princess, that are classes that only specific characters can possess.  You can also have monsters on your side as well as chocobos.  A portion of the story is told after every new battle you encounter.  The story is there, and it is pretty thin, but it still has the basics of a Final Fantasy Plot.  The music is wonderful (just like the rest of the series), and the main characters have their own unique personality that makes the game memorable.  If you are looking for a role playing game that is only battle after battle after battle then you won't be dissapointed, but if you are looking for a traditional Final Fantasy game, I'd rent it before I'd buy it.