Show me that you can make a call at -121 dB, as anandtech proved on iPhone 4, with an internal antenna. It's a trade off: sensitivity for attenuation. Once you know what spot to avoid, the iPhone 4 is indeed a better PHONE than previous models.
If so, then Apple could and should be making videos showing that the iP4 antenna can be beneficial in some situations.
That would be a lot more impressive and positive tactic.
And a far, far better defense of the antenna than insanely pointing out that it can behave as badly as some other antennas.