In case you haven't read the second issue, this contains Spoilers
Personally I don't think they liked Mike. They didn't seem to have any pity that he was locked away, and Egon said he should have been locked in prison and not some Psychiatric Country Club. If something happened to him and he went insane and tried to kill Ray then I'm sure the guys would have some understanding that it wasn't Mike's fault and been happy that he was getting help, instead of being locked away.
But although they might not have liked Mike he was still part of the group and because of that might have ended up with a part of the Ghostbusters Company Pie. Winston likely wouldn't have been hired because they would have already had the even number to split into shifts and wouldn't need the extra help.
Actually, now that I think about it, Ray seemed pretty beat up thinking about Mike. Maybe Ray and Mike were friends but the other guys didn't think much of him. Since Mike tried to murder Ray, that would have really hurt Ray (No, I mean emotionally). But I think Ray looking at the picture at the end of issue two was a great character piece.