Problem is latency and packet loss are just as "interfering" to streaming media (if not more-so) than raw bandwidth.
If I'm getting 7Mbps and zero jitter, zero packet loss and low (sub 25-30ms) latency that's a far better proposition than 60Mbps, 15-20ms jitter, 10% packet loss and 30-50ms latency. That site on the other hand will simply show that a 60Mbps connection is "higher" than a 7Mbps connection.
All that website will do is wrongly back people up who are having playback issues as "my speed is fine", causing more headaches for any actual technical support (be that netflix's own technical support, or otherwise).
Really if someone want's to simplify the output (not the test, that's pointless), test for jitter, latency, upstream, downstream and packet loss, but just give a score out of 10, 100, or a grade (of which you can drill down if you so feel), muchlike Windows 7's old WEI.