I'm sure you know this because you've seen the architecture, right? No? Well at least you wrote batteries of directed tests to measure its behavior and compared it to a GF2 and a GF4? No? Hmm, ok, so you basically looked at a single feature in a tiny part of the pipeline, and used that to decide that your point was true?
That may very well be but for the end-consumer (what JR was pointing out) it was a GF2 on steroids. You got "SM 0.5" instead of SM 1.1, you got the same amount of video memory (if you had the GF2Ti), etc. Yes there were differences and the clock/mem was higher but in the real world:
http://www.tomshardware.com/reviews/pc-graphics-xbox,423-13.html
http://www.tomshardware.com/reviews/pc-graphics-xbox,423-11.html
You got slightly better perf than a GF2 but lower than a GF3, not to mention that once games started requiring DX8 you were out of luck. Which was JR's whole point: the name "GF4" led people to believe it was better than GF3 when it was actually worse and little better than a GF2.
Carmack himself blasted nvidia for naming the NV17 a GF4 card and actively told people not to buy it and get a GF3 instead.