I flew for 17 years on the DC-9 (20/33F/41/51) and the MD80 series - as F/O and Captain - in a major European airline with a large fleet of the mentioned types.
I have never heard of, nor experienced any control problem when operating on contaminated (incl. wet) runways.
However it is important that the ground spoilers are extended as fast as possible after touch down on a contaminated runway in order to have complete control of the aircraft.
The ground spoilers extend by a wheel spinup signal, so make the touch down a little firm to avoid any skidding, which might delay the deployment.
In addition, when the nosewheels touch down the weight on wheels switch will send a ground spoiler deploy command, and of course they may be deployed manually.
Very nice airplanes to fly!
brgds