Last year was essentially his rookie year (even though his stats show he played 20 games in the 15-16 season??? i have zero recollection of that, but, to be fair i think we've all tried to block that out) and I always thought people were being a bit hard on Linus, forgetting that he was indeed a rookie (since he's been a part of the organization for years now).
Looks like in 37 games last year he had a .905% and 3.11 GAA
This year, in 34 games he's posting a .911% and 2.69 GAA, so he appears to be trending upwards and the eye test tells me he's more in control and collected in the crease. I'm expecting him to continue to improve. How much? Who knows, goalies are ***** weirdos.
If I'm Botts, I'm brining in a 3rd goalie to camp, someone who used to be a bona-fide starter but is not moving into a back-up role at this stage in his career (think Ryan Miller in Anaheim) to provide some competition. We then waive Hutton and send him to Rochester. Then, when an injury inevitibly strikes you can call up Hutton so you have a better option than Jonas Johannson. Not ideal to be burning that kind of money on a goalie in Rochester, but that's what happens when you sign a career back-up to a 3 year contract...another big whiff for JBOTT.
In summation, to answer your question of "how good is linus ullmark?" , I'd say he hasn't reached his full potential and we'll see him get better.