Works for me as often as not. The key is to slow the 4 gate til my colossus is out. What I do depends a lot on what my opponent does. A common 4 gate is 1 stalker, 1 zealot, 1 probe sent to my base and they try to build a pylon at my ramp. So I have 2 zealots "fight" their units while 2 more zealots and a stalker take out the pylon before they can warp anything in.
I think what Pinder was referring to as ridiculous was you having a collosus out by the first round of 4 gate warp ins....
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