A handful or so people having issues, it's definitely the game.. But I'm curious tbh, are you saying the game just shuts down for you while playing? If that was the norm it should reasonably happen to all of us? You might be right, the game might be completely jacked and unplayable and I'm just the luckiest mf around having no issues.
Regarding a "complete save". First off, there are branching choinces in the story so you can't have one "complete save", you'd need several. Second, why would you want that? The game gallery is unlockable right from the start. Third, I don't have one to share since you generally can't use old saves and I only play the new content each patch nowadays, I don't replay the entire story from scratch every time.
Cheers