Lukas, I found most recently that somehow posting a Status Update on SCN works much better than the official SAP support chanels. Our EHP6 upgrade would still be stuck if it wasn't for our Fairy Godmother. 
I wish I could join your rant but our consequent incident regarding an invoice IDoc still has not even been opened by SAP (well, it's been only 12 days, I'm not losing hope yet), So I'm still just looking forward to repeating the same information.