I was happy with 3.1, it worked well.
95...the worst OS I've ever used due to crashing constantly.
98...Not too bad really. They just never got the, "sleep/screen saver/power button" to work right.
XP...the best so far IMHO.
Vista...didn't like the transition, but overall acceptable. It has its quirks however.
W7...they started going into the, "Protect the user from doing harm to themselves". NOT a good thing if you're a hardware/software guy.
W8...I can only imagine how handcuffed the average user will really be, and them not knowing the difference.

If Linux ran windows apps. DAMN, MS would be gone already.....from my boxes anyway.