I played the first one and was amused. I might not have enjoyed it as much had I not been a big Penny Arcade fan since I'm not the biggest fan of jRPG. But even still, the story and jokes were fun and didn't require you to be into PA to laugh or whatever.
I haven't played the 2nd or 3rd ones yet though. I might try them at some point in the future though.
"Space. It seems to go on and on forever. But then you get to the end and a gorilla starts throwing barrels at you." -Fry, Futurama