I own Demon's Souls, played through it numerous times. I own both Dark Souls 1 and 2 but found both kind of boring and didn't play either much. Heresy, I know. The invasions in the Souls games don't annoy me, it suited those games and added to the overall tension.
In Watch_Dogs it does annoy me. It's like the GTA IV phone calls, you'll be in the middle of a shoot out or just screwing around and Roman phones you up because he wants to go bowling. At least with GTA IV you could hang up or ignore the phone call. In Watch_Dogs you have to drop whatever it is you're doing and hunt down some random asshole. It actively interferes with what I want to be doing. So for now, the online is disabled.
Yeah, I disabled the online stuff before starting the game as I didn't want others getting in my way. In the past I've always gone for 100% completion, but I'm not going to bother with the online stuff in Watch Dogs. In addition to MP-based challenges there's also the landmark app badges -- some of them are tied to the online component ("Be the mayor of the three different locations at once", for example).
Worse still is that AssCreed Unity's completion tracker is undoubtedly going to be set up similarly. The writing was on the wall with Black Flag's "social" chests/convoys/whales (which I did complete), but this doesn't make the transition any less annoying.