So far from what I've played I'd be tempted to give this game a 10, it's incredible - but...
Supernova is unplayable if you don't want to be a lone wolf, you either have companions set to passive and have them hidden in cupboards/behind rocks (which kills immersion and doesn't let you utilise their pretty awesome abilities) or they die, literally stub their toe on a staircase and explode into a bloody mess. It's awful, I dropped down to hard because I want to use companions, which is just idiotic.
No game can be perfect but this is a completely arbitrary and enforced rule on what otherwise is an incredibly well implemented game mode. Supernova rocks the socks off of survival from Fallout, has really good HUD tracking of your needs and isn't overly punishing on death as you still have town entry/exit autosaves to fall back on. Yet you can't access the gamemode unless you play solo, how many Zero G's did the person behind that decision down before work that day?