The Premier League new boys take on the Gunners at the Emirates Stadium on Saturday and Rangel can sense a marked improvement from the North Londoners is on the cards after their humiliating 8-2 loss to Manchester United last time out.
"In the past, they had players like Tony Adams and Lee Dixon who ensured they had a rock solid defence and everyone knew it would be tough trying to score against them.
"So to see Arsenal concede eight goals was very strange. Saying that, they had a penalty saved when they were 1-0 down, so if that goes in then maybe the score will be totally different at the end.
"They will be fired up and looking to make up for that defeat - we know that - and they have reacted to that by making some great signings.
"Per Mertesacker is a quality defender who will bring a lot of experience to that defence. They have superb players going forward, but someone like Mertesacker is exactly what they needed at the back.
"The left-back Andre Santos is highly-rated too, while Mikel Arteta has so much quality. He is a very skilful player who is comfortable on the ball.
"I know they were criticised a lot after their last defeat, and you hear some pundits saying they will struggle to be in the top seven or eight. But that's crazy - they will be in the top five, at least."
He added: "People say it may be a good time to play Arsenal, while others think it's a bad time.
"But Arsenal are a quality team, so it doesn't matter when you play them. You know you are in for a very tough game."