The world is gorgeous, massive, and deep as a puddle, but you're not meant to play it like a life sim. The story isn't going to win any awards for having the most mind-blowing plot twists or unique story beats, but it's compelling regardless - I still remember marathon-ing my way the end credits and looking out my window to see the sun rising.

I can't speak for online, as I only played it briefly, but I do remember feeling like there was more to do in the Online than there is in the post-storymode singleplayer. I had a little bit of fun fucking around with friends, but I do prefer the peace of singleplayer/solo online, as (in my limited experience) seeing another player on the map is a guarantee that one of you is going to die.