well it's pretty simple, first you have to understand it, you can learn by enter any feed url into
http://www.feedvalidator.org
and when it comes back failed, read why
The fact is they are just hiring these overseas 5 dollar coders who never looked at RSS feed before in their life, and/or looked at other borken feeds and think they can just make up anything and expect it to conform itself into everyones (societies everyday) use... if you think about it.. its like trying to buy pc software and go home to install it on a mac.. the shit just aint gonna work hehe