In a way, the main thing that really helps the Xbox version (as something that convinced me to not simply stick with the Dreamcast), is voice communication. This is simply because it's so much easier to communicate what you want people to do, with voice, than using the usb keyboard (which is also an option). This is partially because I play as a force, mostly, and you find out quite quickly that doing all your commands, prepping stuff, is a bit too much and try to communicate stuff in time for your hunters, before they all run off.
However, like pretty much every version of PSO, you really want to play with friends, or people trustworthy. In a way, that's turning out to be a way to play for almost every online RPG, these days. Though, I guess stuff like FFXI and WoW are easier facilities where you have everybody together, and can avoid cheaters, without sticking simply to just grouping with friends. Guild wars suffers similarly to PSO, but I would say it has the highest ratio of people I don't want to play with, I've ever seen. However, like PSO, the option of avoiding them and sticking with just trusted friends, saves it.
FFXI has one achilles heel, as the above poster says, in comparison. That is, rather slow returns. You need more commitment to get anywhere in it. It's still pretty nice, but you simply need more patience and a willing to commit some time.
The nice, but dangerous thing, about the others, is fast returns. You are almost always close to getting that new cool thing. This is how it gets you with that, "just one more" disease.