For me, I like Win98SE more than WinME simply because WinME has more bugs.
I am using Microsoft Mouse yet I am having problem with Microsoft OS. The mouse will move erratically if you set the mouse speed and acceleration too high. Then, there is no more DOS support (at least you can't access from ME). The performence benefit ain't big. You won't get huge fps increase in your Q3A. The most thing I hate is WinME apparently shut down the HDD before OS ready to shut down. This result hang and crash on my PC, so my ME cannot last longer than 1 month and compelled me to format it every few weeks. On my old machine that don't support ACPI, it is even worse. Today you install ME, the next 2 day you cannot start your computer already. A blue screen come up everytime WinME start saying "Windows protection error". Sucks!!!
Although ME has a build in backup tool, but you can't even enter ME even in safe mode, what is the benefit of having that backup tool? But in terms of user friendly, ME really stand out from 98SE, but that couldn't make my mind to shift to it because it has just simply too many bugs. Yes some of my older games also cannot run in ME (even can run, the game behave strangely).
So if I rate ME, I will give 2 out of 5. Why don't you use Win2k? I am using it and it is really rock solid stable, my computer had been running many many hours but still didn't hang once. But of course Win2000 is slow at fps. That is the downside, hopefully Whistler will overcome this.