Geekbench is a pretty awful measurement tool. Look at a plot of results for the same computer:...
I agree, this is what I am always saying,... Hence I do real life tasks (like copying a big file and stop the time to complete or convert a video, etc.)
Would be nice, if there was a script that could easily be launched without much command line knowledge, that starts several "real life" tasks.
For example there could be a test file, that can be downloaded and then the script can tell the Mac to copy that or open it in Handbrake and convert it with a strict preset.
A folder with all things needed (script, files of different size, one movie file, a psd photo file,...) could be prepared and presented for download, so that one has everything he needs to do the test.
(Or we would agree on some task that everyone can do and then we report back the times).
There was a graphics card benchmark that should the same results for cards with the same model name, but different clock speeds, that wasn't quiet convincing to me.