...on-topic:
Ubi initially said they just couldn't cope with the traffic, but then a few hours later claimed it was the result of a DDoS attack. As far as I know, they haven't produced any actual EVIDENCE of an attack, but it's plausible, anyway.
There are a couple posts on GP about it. I've spent some time in the comments threads. You might like them; it's kind of like here but with like five Drethelins.
My viewpoint is probably predictable: I find it hard to condone a DDoS attack (if one actually existed), because it hurts the customers who bought the game.
BUT, it couldn't have happened without Ubi's asinine DRM scheme. And Ubi should have been prepared for it. Look, I've served my time in the trenches, I've sniffed my fair share of packets and fought my fair share of losing battles against DDoS attacks. But for all that Ubi can wag its finger at those filthy, filthy not-actually-hackers, the bottom line is that it didn't have the bandwidth or the IT staff to handle a predictable scenario.