I have spent over an hour after installing both DVDs trying to get this game to work through Uplay. First is the 10 minutes it took to login to Uplay, then it wouldn't take the Activation Key until I closed out of Uplay and tried it all again. Then it downloads the 1.05 patch, but after it installed and I clicked to play the game, the patch downloader loads again and downloads the same patch over again. If you cancel out of this, you are taken to a ubisoft page to download the 1.04 patch, NOT THE 1.05 PATCH which you need to play with friends online. I found the 1.05 patch on their site here: [...] I do not trust their in game downloader for the reason above. A friend has the game on Steam and Steam handles all this updating automatically, and it much better software than Uplay.
Do yourself a favor, wait for FC3 to get cheap on a Steam sale, and buy it there.