Kujas strat just owned any before it, and heres why:

Carriers = cost too much

Try teching that fast without getting owned?
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The best strat to take down a wall I've seen is, about 2-3 ships full of lots/reavers, right on the wall, just to destroy it, doesnt matter if you lose each one.

Send in dts/lots/archons/temps and games over. Seen it work many times.