The .hack series finishes up nicely.

User Rating: 8.5 | .hack//Quarantine Part 4 PS2
Pros:

-Amazing and original story that builds up to a great conclusion
-Great character and enemy designs
-Great soundtrack
-Able to convert data from past volumes

Cons:

-Gameplay hasn't changed and is still repetitive
-Graphics hasn't changed and dungeon designes get repetitve after a while
-Must play the first three volumes to understand the story.

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If you don't have the first three .hack games, I suggest you buy or rent them before playing this one. If you don't, you'd be at a level disadvantage and you would be confused with the story...

Volume four continues where the third volume left off. Providing a lot of story, it concludes the .hack series very nicely.

The graphics still haven't really changed, but the soundtrack is still something that's great to listen to...

The gameplay also hasn't changed and is still repetitve...

This game would last 20-25 hours and doing all the sidequests would take another 40-50 plus hours...

Overall, another great volume and an excellent conclusion.