Getting unplayable performance even after tweaking in any game is frustrating, so I understand your anger here. But as Marky pointed out, it's just flat-out wrong that the game doesn't run.
I've got a Core 2 Duo E8500 at 3.8 GHz, 3GB of PC-8500 RAM, and a GeForce GTX 280; I run at 1920x1080 with all graphics options maxed, and I got what I considered "playable" framerates, meaning 15-30, as you say.
Bottom line is, there's a lot going on in this game, so it's going to take a strong machine to run it. Unless you're overclocking your CPU, I'd guess that's the weak point in your setup, followed by (possible) the 4870, which is a good card, to be sure, but seems to trail the GeForce 280 by 10-25% in most games.
In the end it comes down to what you consider playable. Sure, I'd have loved to play the whole game at 60 FPS, but it's just not possible. Given that, I'm OK getting a steady 20.
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