Thank you very much for the compliment kind sir =D It's actually quite a solid strategy once you get used to using it. I haven't lost using it yet. Although normally i would send over an observer first, I already knew from the void ray that he had missile turrets so it wouldn't of gotten far in terms of scouting =P
I made a Mothership strategy video for starcraft 2 that shows how to use the Mothership Vortext ability at high level players. Also, I try to incorporate a lot of interesting information on how to use it. I think the vortex ability is fairly underused, In this video axslav use it very well against his opponent. I don't think I have seen the Mothership's mass recall ability used at all lol.
Blade, you got really lucky If he expanded, and took map control, and scouted (which he did), and took action accordingly, you would have been pretty screwed. Saw stargate -> go vikings. Saw 5 gates -> Go m/m/m + hellion/tank u bring ur ms in, he'll have huge eco compared to u, and vikings take it out (which u might vortex and use stalkers to take out), and thus the m/m/m + mech comes into play. hellion take out lotta zlots, with tank support for stalkers. u shuda scouted more, then own him moar. I agree that vortex is fairly underused. I love it. 200 supply army vs a crapload of bc and thors. vortex half them = i win.