One of the stories over at Hacker News is Thinking about using Facebook Connect on your site? Step one: Abandon your will to live. Most of the comments have been negative, and I think the general tone can be summarized by a quote from the top comment:

What isn’t outright broken is ugly, poorly documented, highly fragile (works one minute then fails, then works again for no reason), unreliable (occasionally major parts of the API just break during upgrades with no notice), full of arbitrary and unexplained constraints (how many invites / notifications / emails etc. you can send all have built in limits per day after which they just stop working) and if nothing else, it’s just ugly as all hell.

When I read all of these articles about how revolutionary the API/developer options are from Facebook, this is what comes to mind. It’s an unfortunate reality that will hopefully one day be resolved.