The game starting and running at a playable level is minimum standard. I don't want pull the gamer entitlement card, because I really hate this shit just as much as any other PC gamer, but don't tell me that the game is "broken" or "unplayable" just because it doesn't run at 60+ FPS.
Neither developers nor publishers are magicians. They can't just take all of the time they want, or spend money like they're rap stars. They have deadlines and budgets, and odds are that the work required to make the game run flawlessly at 60 FPS simply didn't fit withing those constraints.
They have to hit that hard PC launch deadline. Definitely don't have the luxury of taking their time.