Disclaimer : I am not a goalie expert nor am I trying to pretend being one.
That being said, here's my assessment of Korpisalo. Evidently, I think we can all agree that he's had his ups and downs. He's made some great saves that show flashes of his potential, similar to what he showed in the playoffs last year with the Kings. Obviously the issue is consistency for a whole 60 minutes and ill timed goals against. I believe some of it can be attributed to the team as a whole and the trademark Benny Hill themed team defence this franchise has been playing for the past 5+ years.
He's exactly the same age as Anderson was when we acquired him (29 going on 30). Has a lot of years ahead of him if he can stay healthy. I think that with a good system that supports him instead of highlighting his weakness that provides some kind of stability, he has the potential to be, at the very least, a good / above average #1 goalie.
If he ever reaches that potential is a whole other debate, but he's showing good signs imo and he hasn't played enough games post-surgery with an "organized" team to say with certainty that "he is what he is". Jury is still out, but I'm ready to give him a full year after this one to really see what we have here. He's already looking better in front of a Martin coached team.