Marker drones are a constant part of my army now, too. They're more expensive than a Fire Warrior, but add them to a unit of Crisis suits and you're suddenly hitting on a 3+. Yeah, that works for me.
One of the tweaks I made to Tau of War's army list was the inclusion of Marker Drones. It's a steep cost, but when going up against foes like the Space Marines, isn't a better chance to hit worth it? I definitely think so. Kill them before they can assault you.
So don't forget your laser-pointer-toting friends in your army list. They'll never steer you wrong.
Prosper, as Tau shall.