Is it a perfect game? No, but believe me… it is worth it!
What will you need to get started besides your Xbox360 console? An Xbox-HD, Xbox-live (and obviously an internet connection), pay a monthly fee ($13/month + $1 per additional content ID) and a lot of patience to start (an USB keyboard is not required to play, but please get one you will thank me later).
This game consists in the original game and all the existing expansion. This game is a multiplatform MMORPG, but be warned, this also means the whole online experience is based on Square-Enix’s PlayOnline service and (using Xbox-Live only as a tunnel), that means expect no voice-based communication, no Xbox “achievements” (trust me, you won’t need them for this one!), no “next-gen” graphics (in this case I would even say “who needs them as long as the game is good!”).
Is it better than the PC or PS2 versions? Not really, it is the same game after all, but if you have a low end PC or you have a 720p capable TV, you will probably get better graphics than what you have right now (at least for me it is quite noticeable when compared to the PS2 version on my TV).
The game has a slow start and it gets a little bit to get used to it, but after a few hours of playing it (and I mean > 4 hours) you will be on a roll and enjoying the game, and believe me… you will come back time and time again! There is always something to do and enjoy.
Be warned (and please don’t be discouraged by this!): This game requires a long time to be installed before you can play (at least a couple of hours). That’s right, this is not an “insert DVD and start playing” game (which is an oddity on game consoles), just start the installation and go read a book, or visit the FFXI forums (to learn more about the game).
Last warning: Once you have played it, you will spend a lot of time playing it! (and I mean it). Don’t let this game to affect your performance at school, your job or your social life..