The MMS is a very situational piece of equipment. If you're using it by trying to scan through everything, then you're limiting yourself and your play style. Think of it primarily as a type of Red Dot Sight that has a little added bonus: the ability to see through walls. So, play normally, then use it to scan into rooms or corners before you proceed. For fast-paced games like Dom and KC, it probably doesn't have a lot of uses. However, I do find it a bit useful in HC Dom for scanning flags and other areas. The low health means you can punch through walls pretty effectively with it in HC Dom.