Darren Ferguson said stern words were required to bring Rovers to life in their FA Cup clash with Stalybridge Celtic.
Andy Williams gave Rovers the lead after three minutes but they laboured against non-league opposition at the Keepmoat.
The hosts improved in the second half with Williams adding a second to see Rovers through rather comfortably.
But Ferguson says he expects more from his side.
"I had a few words with them at half time because the tempo wasn't quick enough," he said.
"We asked for a good start and we got a great one with a good early goal.
"But I think that hindered us because after that we got a bit sloppy.
"You know what it's like when there's only one goal in it. You don't want it to get edgy.
"The second goal clearly helped us and in the second half we were better.
"We did the simple things better, like keeping the ball.
"It wasn't horrendous. It wasn't a bad performance but it needed to be improved."
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Ferguson insists Rovers remain a work in progress and are not close to the levels he wants to take them to in the coming months.
But he says he is delighted with the progress made since he took charge last month.
“We’re no where near where we need to be,” he said.
“That’s not a criticism because I have to say in the short time I have been here, the players have been fantastic.
“We’ve had two clean sheets and it doesn’t matter who you’re playing against, you have to get that winning mentality.
“There’s things I need to change and that will take time.
“But the players have been really good and I’m really pleased for them after this win.”