PSOoh PSO. So many things to me, including why I am like I am today. Youre probably only interested in the actual gameplay however, so I wont dwell on my memories.
Its not a casual game, Ill say that. Sure you can play it so, but getting a lot of the good stuff takes real patience and communication with others, and even then its not a huge difference youll notice. Leveling up after level 100 is long, hard, and not too rewarding. So really if you need something to suck up a lot of time you can gripe about with your friends online while playing for them, go for it. Its very fun online to just do a run with your buddies, but bare in mind the servers are full of bad things like cheaters.