Well the first thing to say is that I've not said bowns is a bad goalie. I have said though that I don't think he's in the top tier of goalies in the league anymore. In fact I don't think he's the goalie he was when he departed for Austria.
I'm terms of his issues, the first is his puck handling. He's never looked ready to make a long pass to catch opponents on a line change for instance.
My real concerns come from his positioning and technique in front of his net.
Bowns'has always been a reaction goalie. Those reactions will inevitably slow as time goes on. As a result of that, last season, we saw him moving off his post early in anticipation of a cross ice pass. This left a gap one the short side. This brings us into his lateral movement, which is sometimes uncontrolled, resulting in him being out of position. I believe this is a big reason why he looks spectacular - because he's forced into last gasp saves. Of course, part of this is also down to rebound control issues.
I'm sure that someone who has played in goal could offer some insights, but that's the way I see it.
If course, none of those is to say that he can't play very well at times. What I am saying is that over the course of the season against good opposition, these issues will be exposed both for the devils and for GB.
(Oh, and I'm on record as having said very similar things in the past.)