Well let's see. You spent $900 on two 8800 GTX's over the last 2-3 years, and admitted that they give you problems with microstuttering/glitches/heat, and you are upset that a $343 GTX 285 doesn't have higher framerate with one game? Okaaaayyy
The mere fact that the GTX 285 is a single gpu and call pull comparable framerate to two prior gen high end GPU's in SLI is an advantage in and of itself, since there is no multi-gpu related problems like you described above.
Getting 2x higher performance from one high end card to another in a 2-3 year timeframe is expected. Comparing a single GPU to two in SLI is always an apples to oranges comparison because of the issues with multi gpu.