Um... let's take a closer look at the numbers: they're comparing a 2.16Ghz Core 2 Duo MacBook with a 2.0Ghz Core 2 Duo Dell - not exactly running the same numbers 🙄
Just based on the rated Ghz above, it's a 8% difference...
Let's just look at the first test, the multimedia multitask. It took the Dell 1017 seconds; the MacBook 963 seconds. What if the Dell had a 2.16Ghz Core 2 Duo? Adjusted at 8% faster, it would theoretically complete that test in 1017*.92=935 seconds... faster or at least comparable to the MacBook.
The MacBook does beat the Dell on the iTunes encoding test but I don't know if they're using iTunes Mac OS X or iTunes Windows version on the MacBook.
So no, I wouldn't say the MacBook "rules" 😛
Again... it depends on your needs.