My favorite Haqq unit is the Muttawi'ah. And really, what is not to like.
First, they are impetuous and irregular, so they are mobile. They can be half way up the field on their own orders. They are cheap enough to dodge mines or force your opponent to waste orders on them.
Second, the are Dogged. Not only do they have courage, but they have an extended life. Sure you can lie them down, so they can be healed, but sometimes you need them to be in the way. Better yet, it lets them use their chain rifle without regrets. If they take a wound, they still can Rambo around the table and cause havoc.
Third, they have smoke. Haqq does not like firefights. They are button pushers and classified achievers. Smoke allows room for models to move into better band ranges, run up and heal down troops, hit buttons, etc, by obscuring lanes of fire. Combine them with a Djanbazan and they can create stacked firefights.
Fourth, Mutts have jammers. Jammers are a nasty piece of special equipment that allows the Mutt to make models irregular in their zone of control. Line of Sight is not needed. It can be used as an ARO without line of sight since it is a special piece of equipment. So, all a Mutt needs to do is hide behind a wall and wait to jammer models that come to close.
Finally, Mutts have EMarats. An EMarat is an EM chain rifle that can isolate all models, but it immobilzes Heavy Infantry, TAGs, and Remotes.
Mutts have so many options. Run to an enemy. If he dodges, shoot them with the Mutts' pistol or jammer them. Ifthe model shoots back, you can chain rifle or smoke dodge.