Okay, after several more days of playing with the Steam version of Dragonball Xenoverse, the main problems have become apparent. Don't get me wrong, it's still worth the full price - but you may want to lower expectations if you're looking for a competition-friendly, and technically sound multiplayer gaming experience. Off the top of my head, Xenoverse has the following problems:
Balance
Right now, balance is completely borked. Players have learned how to abuse certain races' special abilities to stack the odds in their favor when it comes to PVP (e.g. Saiyans going SSJ and spamming ultimates.) It doesn't make it impossible to beat them using the other races, but it will require more strategy and definitely gives one class a big advantage. Single player is also affected in this case because the CPU opponents that are in SSJ form will not revert to their base form, so they always have infinite ki and are able to spam ultimate attacks. Some parallel quests are almost impossible to beat because you'll be juggled by three SSJs. You can beat them by being really good or by using one of the OP Z-souls, which brings us to another borked aspect of the game...
...some Z-souls are so overpowered that they make the rest useless and turn PVP into a mess. It used to be that the neither kami nor piccolo Z-soul allowed players to be immortal due to the massive HP regen when ki is full - DIMPs at least fixed it. Now the new broken Z-soul is the Bwa ha ha thanks for the energy one, which heals a player back to full every 2nd or 3rd hit.
Technical
On the technical side, the biggest problem is server availability. You'd have to chalk this one up to the popularity of the franchise, but it's made worse by the fact that even the Single Player mode of the game tries to connect to the servers. IMO, they'd lessen the stress on their servers A LOT if they changed the game so that single player is completely offline, and that the character data is only updated/saved to the servers when people enter the multiplayer. You could understand the online only approach if it's being used as an anti-piracy measure, but I don't think pirates are deterred. In fact, I think people playing the pirated copy of the game are in a better place since they don't need to connect to the servers and will have a much easier way of playing the game.
There's also a minor problem with the fact that the game relies on FPS for timing. The broken Z-souls is one of the side effects, as the ticks in regen/healing seem to be tied to FPS so people playing in 60 fps or more will have ridiculously high HP regen ticks. Some effects also get borked if you're not locked in 30fps - such as the vanishing move or some ki blasts (the former makes you reappear in the same place, while the latter disappears.) Locking the FPS to 30 fixes these problems.
