actualy queens are quite peskey. if you have a chance, you can make a building and 2 difrent types of units of a queen. that IS good answer. but there easy to counter. turrents, photon cannons, spore colonys, archons, ect
ADDITION:
well ya gotta be fast!!! ive done it be4. its just like the DA's mc trick. like what shadow said

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queens only cause problems if you leave organic units out in the open with small groups, or you get an expansion completly wiped out and they capture your cammand center