Miller echoed the thoughts of manager Stuart McCall, who was let down by the collective performance of his troops, but was more concerned with the defending that lead to the goals conceded than the lack of firepower from his team.
Rangers appeared to have turned a corner with the way they defended against Hibernian over two-legs at the play-off semi-final stage, but failed to adapt to the pacey wing play Motherwell used throughout the game on Thursday.
However, Miller thinks Rangers created enough chances in the game to finish level, with the performance of George Long - who made a string of good saves, including a brilliant reaction stop to prevent Kris Boyd - leaving them frustrated.
The fact the Gers had these chances gives Miller hope going into the second-leg and he explains that while the team are disappointed, they still believe fully in their own ability.
He said: “We came in full of optimism and belief, which we still have, but tonight it’s disappointing with the goals we lost and the overall performance wasn’t as good as what we would of liked.
“As much as we were disappointing we still had chances to score and ‘keeper made a couple of cracking saves.
“We will have chances, we know that, we just hope that we can take them at the right times on Sunday.”
Rangers had plenty of chances from wide areas on Thursday night, but a lot of the crosses fed into the box were of poor quality and easy for Motherwell to clear at the near post.
Miller and Nicky Clark don’t provide the tallest of targets in the centre, so working the ball through the middle may be a better approach given their lack of aerial prowess.
Another option is to start Kris Boyd, who showed he can win headers if given the opportunity, while deploying Shane Ferguson – who was also guilty of poor deliveries – and Tom Walsh on the wings to give Rangers back up against the Steelmen’s wide threat.