Some AC IV Single-Player Content Unavailable Without Online Pass

[Seracen]

At least you could install and play DA:O on PC without having to be online, sure you missed out on some DLC unlocks, but that makes it better than most PC of gaming IMHO. Skyrim requires registering on Steam and doesn't even give you any free stuff for your trouble

I remember just being happy I could mod Skyrim, as I was afraid that Steam would block such manipulation.

I'm not the biggest Steam fan, but it's been relatively innocuous, in my case (thankfully). Although, to be fair, I generally attempt to avoid Steam versions if possible, so as to reduce potential frustration.