Is it really deceptive if it beats the pants off a 2.5+ Ghz CPU tho? And most test of AMD's CPUs have shown them to be faster than the Pentium chip their speed rating was comparing them against by some rather nice margins, so I think the fact that a 1.7 Ghz chip could cream a 2.5 Ghz one is a pretty good showing of the Mhz myth.
Of course before the G5 we had a hard time showing this in practice using a Power Mac, but the times they are a changing! After all, would you consider it deceptive if Apple labeled the Dual 2Ghz PMG5 "Dual G5 3000+" when it routinely beats the pants off of Dual Xeon stations?