No, it was a decent card that was crippled by having half as much memory as it's supposed to, and it was/is extremely overpriced even at launch time, PLUS you have to buy an adapter to use a second display because they put the retardport on there.
From what I understand of the benchmarks, the memory didn't make that much of a difference. Also, the mini display port will actually become increasingly standard as time goes on (see Eyefinity-6 and Samsung's display built for it), so that won't be such a huge issue. If you have a recent monitor, it'll have Display Port and that's a cheap cable adaptor, so I'm not so fussed about that at this point.
Should launch a 5870, it'll be $400, not $600 - what they do is sell it at the MSRP at the time of the card's launch, because does not adjust prices.
PC 5870s are
still selling at MSRP, so if launched one now, it'd actually probably sell at the same price.
But since the new Mac Pros don't seem to be dropping soon, you can count on either a 5890 or 5870 price drop to occur before the new MP's release.
It's a pity, because if it launched right now, it would actually have GPU parity with PCs.
Of course, that doesn't address 's severe OpenGL deficiencies. That's a software fix long overdue.
And speaking of graphics technology and OS X, when can we get proper 10-bit display handling?