I've actually had pretty good luck with the park Wi-Fi. But that's mainly because I know the places where it's most easily accessed: the Pizza Port outside dining area, on the wall facing the ROA near the POTC entrance, along the Frontierland boardwalk or on the wall near the churros cart opposite Star Tours/near the Buzz entrance. Is it available park-wide? Not yet. But where it is available, it's pretty decent. Pretty decent. Not amazing ;-).