Didn't think Forsberg played all that poorly. The third goal was weak as hell, but outside of that he did fine. There was nothing he could do on Kucherovs goal, and the other two were on the defense/forwards, not him. He made some key saves, not just in the last few minutes, but earlier on as well.
It wasn't a great game by him by any standards, but not bad either. Kind of average actually. A botched coverage on one goal, the miscommunication with Stützle on the powerplay, that's the negative side, on the plus side he had a bunch of good saves, especially on Kucherov. The rest of the time he made the stops without much fuss. If you get great team-defense in front of that, there is no issue. If the team botches defense, you get scored on. Not a performance that carries a team to victory, but not one that costs it either.
Actually poor goaltending is something else entirely.