Servers down for an online game only is a big NO NO. If companies decide to go down the online route then they should make dam sure their servers and on-line pipes can handle it - or give a re-fund.
From what I have experianced 5 is total crap anyway and they should have just updated the graphics for 3.
I too can't get this to play! I didn't realise it was online play only when I bought it and I was going to play whilst at sea (delivering a boat in the Med') but have had to wait until I got to my GFs and use her internet. I feel well disappointed at having wasted my money and will be going back to Sh 4. It will be a long time 'til I buy another ubisoft title... I feel ripped off!.