Medo Kamara's free-kick after 65 minutes put Wanderers ahead before David McGoldrick's seventh goal of the season meant the home side had to settle for their fourth successive home draw.
McCarthy said: "I'm delighted with a point because that is probably our worst performance away from home this season.
"The game was not particularly good. I described it as awful, dour and dire in different interviews and that's probably what it was.
"But coming back from 1-0 down and getting a point away from home is great and I'm delighted with that.
"It was a great strike from David McGoldrick. I said to him at half-time that it wasn't his day because he didn't play particularly well.
"A lot of our players were below par considering what they've been like. I told him to keep going and to stick with it and you'll get a chance and you might score as the winner.
"He ended up scoring the equaliser, which is just as important so I'm delighted for him.
"I thought that our defence was great again as well against tough opponents who were prepared to run in behind.
"Their strikers were a handful so I'm happy with our back four and how they played as well."
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- David McGoldrick