The Jambos boss has been singled out for blame since last Saturday's 3-0 home defeat to Kilmarnock. Paul Heffernan's hat-trick ensured a miserable day for a youthful Gorgie side, but McGlynn claims fans need to back off while he strives to blood a crop of teenagers.
The Tynecastle manager has been forced to introduce youngsters like Billy King, Fraser Mullan and Callum Tapping after losing stalwarts such as Ian Black, David Templeton, Rudi Skacel and Craig Beattie just as he was taking over from Paulo Sergio in the summer.
Andy Driver was the latest player to leave after joining Houston Dynamo on loan ahead of a permanent switch to MLS in the summer, and speaking ahead of Saturday's league meeting with Inverness, McGlynn said: "Anyone who feels they've paid their money and want to vent their anger and frustration are entitled to do that.
"But if you're realistic and take everything on board at what's happened here and where we're going, trying to bring younger players through and get them to gain experience to handle these situations, then it is a learning curve based on the future.
"It shouldn't necessarily be all or nothing at 10 to five on a Saturday night. You have to look at the longer and bigger picture and what we're bringing through here. It's only two or three weeks ago that all these young players were the best thing since sliced bread and all of a sudden it's going the other way.
"Football's like that. Should it be in the circumstances we're having to work under at the minute? Some will still be critical of me and others will perhaps understand the situation. Football revolves around different opinions from people."
Hearts will face St Mirren in the Scottish Communities League Cup final on March 17 as they prepare for their second successive Hampden decider. But McGlynn says fans must accept that the Scottish Cup winners are no longer the same side.
He said: "You get to a Cup final and everyone thinks you're a great side and you should just go out and beat everyone. We're going through a massive transitional period which will continue into next season with players going and others coming in until it settles down completely.
"There's a lot of hard work going on trying to bring younger players through and get them the experience and continue to try and get results. We're probably no worse off in terms of being x amount of points behind the teams second and third in the league."