Win ME was superior in every way to Win98 - but suffered from Nortonitis 50% of the time.
Most machines at that time were shipped with Norton pre-installed, and the version shipped with most of them wasn't actually compatible - and it wasn't until well after XP was launched that Norton finally got to grips with System Restore and its implications.
Many machines also shipped (or ended up with) Norton System Doctor installed - and that would eventually kill the system by creating a new file in the Windows folder every 10 seconds until FAT32 ran out of places to put them - this effectively stopped the machine stone dead, until you deleted the files. (and we won't mention Go-back)
Once Norton was exterminated, the OS was great.
It had two notable 'firsts'
It was the first product with System Restore
It was the first Consumer product to do away with DOS
It was also the first product to support USB out of the box properly.
( - and it got me my MVP back-in-the-day, as well