Finch could only manage scores of 0 and 11 in the first Test against India in Adelaide as Australia lost by 31 runs, leading to many asking for him to be pushed into the middle order.
"We're one Test match in and there's a lot of noise around it, so I don't really understand the noise around it," McDonald told Melbourne radio station SEN on Wednesday.
"I think let him play and judge him over a period of time. We're very quick to judge players in that environment, he would have been nervous and he's got to settle into Test cricket in Australia.
"It wasn't that long ago where we were talking him up how well he did in the UAE as a Test opener, so I'd like to judge him after a few more (Tests) to be honest and then make a really educated comment around that.
McDonald dubbed the outcry over Finch’s form an overreaction and said that he cannot be judged solely on the basis of two poor performances.
"At the moment it's a little bit of an overreaction on the back of a couple of innings. Most players are flexible enough to bat in many different positions.
"Is he a Test opener? I think that will play out in time if we give him a few Test matches to settle into that position.
"Then we'll be able to judge him on the performances on the back of that."
The second Test between India and Australia gets underway at Perth on Friday (December 14).
First Published: December 13, 2018, 12:00 PM IST