No... God of War is not going to sell better than Uncharted 4, which might just hit the 15m mark.
As for the metacritic, it's possible. Could be as low as 86, could be as high as 94.
I'd probably say 90 MC and 7.5m sales.
Glad it dropped to 94!
But my predictions were too low on both MC and Sales.
Still don't think it'll sell 15m, my new guess is around 11m.