It didn't "go wrong". We had previously been in the 3rd tier for 6 years. Survival was the brief this season, and any of us would have taken 21st place at the start of the season. A top half finish was unthinkable in August.
But we did way better than that. We stormed to the top of the league in our first season back, and only dropped out of the top 6 a few weeks ago. We secured survival around new year, got the biggest win against Them Lot in a generation, stuffed Dirty Leeds twice and generally had some bloody good results, all with a squad which on paper, should be struggling against relegation.
With 5 games to go, we are a few points off top 6, and though I don't think we'll make it, the fact we're even in that situation is a brilliant result. We have overacheived significantly. Yes, it's disappointing that we haven't kept up that superb early season form. But we shouldn't let that take anything away from what Sheffield United has acheived in the last 18 months. It has been nothing short of meteoric. Nothing has gone wrong, and more importantly, a LOT has gone right.