The Glasgow giants have won their last three games in all competitions with three clean sheets, including a 1-0 win over Real Betis.
However, the prosaic nature of their performance against Motherwell at home on Sunday has again turned some fans against Beale and the team despite the 1-0 victory.
Miller insisted that he is not going to point fingers at individuals, but stressed that it is clear some of the Rangers players are not doing their job with commitment and look scared when they are on the pitch.
He admitted that the atmosphere inside Ibrox on Sunday was tough and it is a difficult place for any player to perform once the home crowd turns against their own team.
However, the former striker stressed that playing for Rangers means the players need to show character in such circumstances and insisted that it is not only the new signings who are shrinking under the pressure at the moment.
The Rangers legend said on Clyde 1’s Superscoreboard: “It looks like at this moment in time, and again I am not going to name names who I think it is but I do think there are players there when it gets like this, I am not going to say they are hiding, but they are not putting themselves out there to do the job on the field that they are there to do.
“They are scared of making mistakes, they are scared to lose the ball, they are playing safety football and that is in a really unforgiving environment.
“Yesterday was one of those days when you can feel the whole stadium is coming down on you.
“When you see fans leaving, the stadium was half full at the end of the game. It is a really tough place to be when the atmosphere around Ibrox is like this.
“Listen it’s the best place in the world to be playing when everything is going well but that’s where when you talk about mentality, characteristics you need to represent Rangers, you need to be able to stand up to this and still deliver.
“At this moment in time, they have not delivered, particularly the new signings but even the other lads.”
Rangers are under pressure to beat Livingston in the Scottish League Cup quarter-final at Ibrox on Wednesday night.