It's fairly rated. Singles didn't sell as much pre digital era but it's had amazing longevity, is still relevant and current sounding today, has over 100M YouTube views despite being uploaded 6 years after its debut indicating people are still interested, managed to keep selling to ~2M in the US despite only being certified Gold during it's prime etc. It's an undisputed classic
Also, using deflated stats in the OP is a bit weak

CIL was last reported at 1.959M in the US I believe and is thought to have easily crossed 2M by now