Do I need to have played the other three to understand the story, or are they different stories (like Final Fantasy)?

Different histories.

Not at all.

There is a P3 cameo reference in P4. It doesn't matter, though, as it's not crucial at all in understanding the storyline of P4.

There is one cutscene involving the ultimate secret boss of P4 with heavy reference to P3, but that's the only one, I think...

you don't need prior experience with the franchise. Go for it

No. Different altogether. It least it was so between P2 and P3, didn't play P4 yet.

cool thanks guys

also is it as good as metacritic suggests? ie AAA JRPG...

It's fantastic.

i want it too!but i have the same question.i just found out at wiki that the events of persona 4 take place 3 months after the 3rd episode.can i realy enjoy the persona 4(not just the story)just like someone who has played the other versions.?

I bought Disgaea 3 instead...

You Sir FAIL!!!

lol Jkz but its a good game and you should pick it up when you get the chance again