(No-one should use 95, 98 or ME if they can help it)
It seems to me that OS debates usually have nothing to do with the average user. For example, I use my computer for internet access, e-mail, running Word, Excel, ripping & burning CDs, playing classic games in MAME and that's about it.
Tell me why I shouldn't use Windows 98 if I can help it. I've had it for years with no problems.
I've built many, many computers for friends and family members. I've had experience with every version of windows since Win 3.1 and in my experience, 98SE and 2000/XP are the most stable and have the least compatibility problems.
In my post I was adressing their fitness for use in a MAME cabinet. If you are building a computer especially for this purpose, then you have a choice of what OS to install. Obviously, there are cases where one has to run Windows 95 because they have really old hardware and/or low memory. And I did say, "if they can help it". Obviously, some people do not have a choice. However, if they DO have a choice of which OS to use, they should avoid 95, 98, and ME.
Some of the bigger problems...
Windows 95 has no USB support other than via drivers provided by the hardware manufacturers.
Windows 95 doesn't recognize partitions larger than 2GB.
Windows 98 (original) has OS level USB support, but it is poorly implemented.
Windows ME is just an all around buggy piece of crap and is universally hated.
However, all versions of Windows 9x cannot address hard drives larger than 137GB.
Generally, Windows 98SE is the most stable Windows 9x version and is more compatible with new hardware.
One thing to keep in mind is that ALL of the Windows 9x versions have problems using more than 512MB of memory.
And if you have a motherboard with USB 2.0 or a CPU with HyperThreading, and you want to use these features, you have to use Windows 2000/XP.
Another thing to consider that a large percentage of new hardware doesn't have driver support for versions of Windows older than 98SE because of the new WDM drivers. In a few years, 98SE won't even be supported.
Anyway, these are just my opinions. People are always free to do whatever they want.