The main one being that it requires a connection to the online servers, which are apparently down. As in, you can't even get past the opening login screen. The PS3 game produces an error code and sends players back to the title.
According to the Soulcalibur Facebook page: "We have discovered that the issue requires a resolution across multiple parties and therefore our efforts to remedy the issue is taking longer than anticipated. Currently we are working feverishly with a key partner to implement a solution in the shortest amount of time possible."