Wow people must be really bad. That tactic barely worked on the Beta.
Nuke takes so long to hit now, how the hell do they fall for it.
Mothership is a good support unit. If you can amass a force and send them in, put the MS behind the units to cloak them, it's pretty imba, they can't get through your cloaked army to hit the MS. Add in the vortex ability (used correctly) and it's game over.