What could possibly be wrong with Apple’s precioussssssss? Well, most of the issues seem to be with the wireless, in fact the only issue that isn’t wireless related is a fairly obvious one.
The obvious issue is that due to the small space in which they had to fit a headphone jack, certain headphones won’t fit in the space, the jack fits fine, its just angled wrong or the plastic around it is to big, whatever the issue, the fix is to buy an adapter similar to the one for the iPhone. The wireless issues seem to be far more widespread though.
First off, if you are using an external monitor and close the lid, the wireless signal on the 2.4GHz band is degraded, second, if you are using more than one Bluetooth device, your 2.4GHz WiFi is once again, degraded or completely knocked out. Lastly, if you are trying to use Remote Disc over a wireless N network and the network is running from a non-Apple wireless router, try updating the firmware and it should fix it, for the other two problems, the fix is changing to the 5GHz band or changing which channel you are on in the wireless router’s config, or, as usual, moving closer to the AP.