Played a very funny game last night on Shakuras Plateau. As Protoss, I have already expressed my difficulty/displeasure with mass Mutas, so inevitably, I am playing against a guy who goes mass muta. Taking advice from here, I had blink nearly done, and layed down the templar archives, and a number of cannons (bad macro left me with a surplus of minerals). After holding off for a while, I moved out with stalkers, zealots, collosii, and a few archons and storms. my army was destroyed, but I also took out his third, and a large chunk of his army
By the time I had started to rebuild a significant army, he had denied my expansions over and over again. I eventually whittled down the flock to just a few, and moved out again with Charglot, stalker, archons, storm and a few dt's. Ran into ultralisks and brood lords. that really hurt. he rolled my army, and proceded to destroy my main ( I had abandoned it because I had to protect my mining bases). I had rebuilt some gateways and a few stargates.
Once he eradicated my main I had cannons, two archons, a hand full of stalkers and zealots, and 2 void rays. turns out the only anti-air he had left were some infestors which had low energy. I wound up losing the rest of my military, until 2 more voids I was making popped out. by the time that happened, he had just about killed me, I had 1 mining base and 5 gates, no cybernetics core (aka, nothing). Somehow, I held off the attack, and just ran the remains of my force into his base. Turns out the guy had not been macro-ing at all behind the attack, because he had no mining bases. So with the help of 2 void rays, a warp prism I had forgotten about, and zealots, I won.
TL;DR version. I was having my butt kicked by mutas, lost 2 armys, got steamrolled, saved by void rays and opponent not macro-ing.