However after a side with six debutants produced a sterling display to down the Dragons, coach Steve Tandy was in understandably high spirits.
"It was a pleasing performance. We showed good attacking intent and the crowd and the players enjoyed it," said Tandy.
"It was pleasing to get the bonus point, all in all we scored some good tries, but we probably left a few more out there, and if we had kicked goals it would have been a more comfortable scoreline."
Ross Jones, Hanno Dirksen, Eli Walker and South African debutant Stefan Watermeyer all crossed for the Ospreys with young fly-half Matthew Morgan adding three conversions.
The Dragons scored two tries of their own through Pat Leach and Luke Williams but ultimately fell short to see their quarter-final hopes virtually extinguished.
However assistant coach Rob Appleyard chose to take the positives from the result.
"It's been good for us," Appleyard said. "As well as getting some players back from injury we managed to get all our bench on and some of the guys will be better for it.
"We were disappointed to let some easy tries in, I am sure the Ospreys would say they were well created but we felt they were soft and we will have a good review next week and look towards the Saracens game. But it was good to see us pull it back with the last try and that gives us a chance to build for next week."
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