Don't get me wrong, I agree that those things matter as well. But if you don't enjoy the mechanics themselves, I don't see how you can enjoy them just because of context. Think of it as a job. If its a job you hate, doing it for money is better than doing it for no reason at all, but I don't see how you can enjoy it even if you're doing it for a purpose. Similarly, if it's a job you love, getting paid is just an added bonus. You would do the job for free because it's pleasant in and of itself. Most action games like DMC, NG and Bayonetta don't need much more justification than "You here, enemies there, have fun." Or, for a more retro example, Tetris. Simple, fun, absolutely no context, one of the most enduring games of all time.
So you saying that context completely changes how enjoyable the same mechanics are, to the extent that AC disappointed you to this much for including not THAT much downtime, is just weird to me. Honestly, if I was looking at things like that, then AA really fell apart towards the end with an overly long Poison Ivy section.