No gloss on things can salvage today's sense of bitter disappointment. This team was not built to require a dubious penalty simply to muster a third point in five games -- sending them to Borussia Dortmund in two weeks' time needing to better Ajax's result simply for the right to take on another spring tour in the Europa League.
It can be difficult to extrapolate the truth from the fictions Mancini spins at times, and it certainly seemed deeply pessimistic of him last night to suggest that hopes of Champions League success were a long way off, citing Chelsea's 10-year wait.
Rafael Benitez and Roberto Di Matteo won the tournament at the first time of asking with Liverpool and Chelsea respectively. City won't wait for ever.
The manager was spiky when the notion of dismissal was put to him -- "No. Why? Why?" -- and the Abu Dhabis consider it a source of pride that the manager's door is not a revolving one.
But a commanding retention of the Premier League is now required to demonstrate that the club is travelling somewhere under him. He's safe until the summer. Beyond that, no guarantees.
There was a bold flourish of the tactical wand from him last night; the three-man defence which has not started a Champions League tie for him. It was an unmitigated disaster. It was not so much the system which failed Mancini but the personnel, Jose Mourinho's side easing in behind the wing-backs so often that for the first 15 minutes it was like shooting fish in a barrel.
Mancini said that he might call in the police to catch Ronaldo and the local constabulary could certainly have done no worse. It was not just the pace and trickery of the world's greatest counter-attacking midfielder but his ability to drift away, unnoticed, into pockets of space -- everywhere.
Take your pick from any one of half a dozen early advances which left City looking a very long way from greatness. The sharp, low cross which Sami Khedira allowed to run across his body before unleashing a shot was a premonition. The gorgeous lofted ball from Xabi Alonso which let Ronaldo spring the offside trap looked like an act of demolition. Ronaldo chipped Joe Hart, Matija Nastasic swept around the back to clear off the line -- straight back to the tormentor-in-chief, whose shot the goalkeeper brushed wide.
And none of that takes account of the latest piece of comedy defending which allowed Karim Benzema to deliver the Spaniards a 10th-minute lead in the first place. Angel Di Maria's clipped cross looped over the head of a terribly immobile Maicon and with every member of the City defence transfixed, the ball arrived at the Frenchman's feet to poke it in.
Vincent Kompany had the kind of opening which belongs in nightmares as Ronaldo twisted him into small pieces, a situation which improved mildly when Mancini resorted to a four-man defence midway through the first half. David Silva fizzed away throughout the opening period. Edin Dzeko looked less potent as a starter than a substitute.
Once more in Europe, Mancini was casting about for a change. Javi Garcia's arrival after the interval, in place of Aleksandar Kolarov, gave City the central rigidity which allowed Yaya Toure to advance a little.
City's dubious penalty was adorned with a red card for Alvaro Arbeloa, whose tangle and tumble to earth with Aguero as they both reached for Toure's deep ball seemed nothing more than that. Gianluca Rocchi, the Italian referee, saw something else and Arbeloa's second yellow was followed by a penalty which Aguero dispatched.
The Spanish counter-attacks were quelled. Mourinho even appeared concerned enough to indulge in some ironic clapping to the official and City's supporters when the dot matrix board stated the game had five minutes to run. That was long enough for Silva to loft one last ball, which sub Carlos Tevez could not control. Mourinho's reaction was mock horror. There were no shrieks of tension. Everyone knew it was already over.