Given the hype for Bobcat, and also considering Bobcat is out-of-order while Atom is in-order, personally I don't find the performance all that amazing.
Compared to a 1.8Ghz Atom D525, the gap would have been even smaller.
In the single-thread Cinebench test, Zacate E-350 beats an Atom D510 by 65%. However that is a very specific benchmark, and not all results will mirror that.
In the multi-threaded Cinebench test, Zacate is only 11% faster than an Atom D510.
Yes per-clock Bobcat easily performs better than Atom, and this was expected. However when looking at multi-threaded performance, and looking at overall performance, the gap is not quite so big. Atom's HT helps quite a bit, and although it was not tested here, the top Atom (D525) runs at a higher clock than the top Bobcat. We should see dual-core Atoms hitting over 2Ghz next year as well.