I *think* the issue is (and this is IMO) most major MMO's need more freedom to patch the game, and add/change content at their desire. As far as I know, XBL really isn't the most flexible thing for such, which can cause the issue(s).
In the case of FFXI and PSO, both games were pretty much done (as far as I know) when they went on the 360. Because of that, they were very stable. Unfortunately, new MMOs designed for this generation don't have that luxury, which can cause the issues.
Back from the dead, I'm afraid.







