Completely agree. The 465 launch is disapointing, but not nearly as bad as 5830's.
Comparing "launch" to "launch" I would agree that the 5830 didn't stand up as well as the 465 does. My question to you is this: What does this mean and why do you care?
If you are looking at buying a video card NOW, do you care about the status of that card at launch or do you care about the status of the card now, when you are intending on buying it. If you say anything other than "now," I'll know you're simply interested in rhetoric and not trying to make a valid point.
Of course the important matter is the comparison of the products now. Comparison of "level of disappointment at launch" or whatever we want to call it, is interesting only in the context of semi-angsty tech forum posts.
So let's look at them now. Techpowerup gives an overall performance % for the 5830 at 89% of the 465 for all resolutions tested. If we take the going price of a 5830 now (the cheapest I can find is going for 220$ so if someone can point me to the 200$ price points, I would appreciate it) this means that the 5830 gives you 89% of the performance of a 465 for 79% of the price. That seems pretty damn good to me.
The value proposition for 5830 vs. 5850 doesn't shake out quite so well. You get around 35% more performance from a 5850 for around 25% more $$$ (numbers also taken from TPU) but that comparison makes a little less sense. The 5830 and the 465 are in the same performance class, the 465 and the 5850 are not (as I judge from an aggregate of about 20 reviews I have read).
In short: Comparison of "launch" to "launch" is silly and bordering on meaningless.
That said, I don't think the 5830 is a great card either. Current prices are marginally acceptable but the main problem is exactly what w1zzard pointed out: The 5830 doesn't have a "sweet spot." It is overpowered at 1680 x 1050 and not quite powerful enough at 1920 x 1200.