Honestly, I think that's brilliant. I also think the educated members of the Tom's Hardware community can verify this. For general productivity, the average computer user is running software that is, at most, optimized for dual cores. As it stands now, all benchmarks use metrics in one program running at a time - which is highly flawed in practical terms, since multiple programs are usually all running at the same time, demanding resources from the same CPU. Quad core alleviates this greatly; I actually wouldn't mind seeing a benchmark of having Outlook, Excel, Word, a Web browser, and iTunes all running things at the same time to really gauge the power of a quad core vs. dual core cpu.
Rambling a bit now, but I think Dell's actually done something right here.