I can't really say I agree with you. There are a lot of good books on the subject, there are a lot of great tutorial sites (free) on the web (look at scott stevenson's work, or cocoa is my girlfriend, or CocoaDev). The mailing lists are pretty heavily trafficked, as is the #macdev irc channel (if not always entirely helpful).
The API documentation is better than most development environments I've worked with. Admittedly, Apple's secrecy problem gets in the way of publicly acknowledging bugs, missing features, or planned upcoming features. These things can be frustrating. Apple publishes a large selection of sample code though. In fact, they ship a lot of it with the developer tools themselves (plus all the docs), so you don't always have to go looking through the website.
iPhone development is undeniably worse right now. I imagine this will change over time, but I agree their is a lot of work to be done on that front.
There's a Google group where people can make suggestions for additions to the site. Objective C is probably a sensible one to include, at this point, though.
