Was always a strong critic of Johnstone but he's warmed on me the past couple of seasons.
Great shot stopper and penalty stopper - kept us in some games last season despite the defence having given up for large portions of the season.
He doesn't command his area well and seems to get lost at set-pieces but how much of that is due to defence losing their man I can't say - and we've hardly improved in that area going into this season. Maybe Ismaels high press will mean the defence are less exposed this season and he'll have little to do.
What he lacks is that little bit of a nut-case edge that a lot of top goalies have. I've never seen him get fired up, bollock his defence and start leading from the back. If the defence aren't doing their job, yell at them. If you're sick of flapping at corners, get out there and win the ball and knock somebody on their backside.
That said I'd be happy if he stayed, not overly convinced by Button or Palmer and can't see who we'd get in to replace him.