I wouldn't give it to strange everytime, I just would say Batman would have more of a fight on his hands than most people would realize.
Strange trained with gods and angels to master martial arts, and has been doing it for thousands of years.
Strange just gets 0 respect when it comes to h2h fighting.
To be completly honest, Strange sorta got lucky with Mantis.
She attacked, he dodged, dodged, blocked, then outsmarted her and tripped her up, then layed her out with a knee while she was getting back up.
Just dodging an attack by mantis is note worthy, batman certianly couldn't do the same IMO.
Then he faught Blackpanther, BP was using some gun, and DS unarmed him and K.O'd him pretty easy.
I think it'd be a really good fight, but only if Strange is written to his full potenial in h2h.