O'Driscoll - not blaming anyone.
Doncaster manager Sean O'Driscoll refused to apportion blame after a mix-up at the back gifted Cardiff a late equaliser and denied Rovers what would have been a deserved win.
The newly-promoted home side looked set to continue their promising start to the Championship season when Lewis Guy struck for the second successive Saturday in the 67th minute.
But Scottish striker Ross McCormack, who had a spell on loan at Doncaster three seasons ago, snatched a fortuitous late equaliser for Cardiff.
The goal came after Rovers goalkeeper Neil Sullivan and captain Adam Lockwood collided following a rare moment of indecision at the back, but O'Driscoll said: "It was a disappointing mix-up but it's pointless picking out someone to blame.
"What pleased me is that I thought we upped our game from last week's performance when we won at Derby.
"I thought there was a lot of hype after that match but we played a good passing side today and matched them and that's the pleasing aspect from our point of view."
O'Driscoll added: "I didn't think we eased off, it was just a mix-up that cost us the points but we got a draw and that's another step in the right direction.
"I think our play probably deserved three points overall but it wasn't to be."
Doncaster started brightly, with Richie Wellens, James Hayter and Brian Stock threatening to grab an early goal.
Home goalkeeper Sullivan then produced a super reflex save to prevent Paul Parry firing Cardiff in front in the 24th minute.
Doncaster were rewarded for their persistence when Guy latched on to a raking pass from Mills to lash home an unstoppable shot in the 67th minute.
Cardiff's attempts to fight back were insubstantial and they never looked like scoring until Doncaster presented them with a late gift, and former Motherwell striker McCormack snapped up the chance.
Cardiff manager Dave Jones felt his side deserved their equaliser.
He said: "It looked like it was going to be a stalemate anyway and their goal resulted from mistakes from our part.
"The only time they played a 60-yard pass throughout the match they opened us up and that was disappointing.
"I thought we probably shaded the first half and they shaded the second. We probably nullified each other because there was a lot of midfield passing from both teams but no cutting edge."
Jones added: "This is a difficult place to come and Doncaster passed the ball well but we stuck to our task and maybe they got a bit nervous.
"I thought probably overall it was a fair result."