In my opinion, it was the greatest OS of all time. I don't know why Microsoft just didn't keep it and sold it as a lower-tiered OS for people who use computers for basic stuff.
I'd say not. Then again I have a lot of experience with many different operating systems, not just those for PCs.
Let's see. I have supported MVS(IBM mainframes), MPE-V(HP minicomputers), VOS(Stratus minicomputers), Ultrix (DEC-Unix), AIX (IBM Unix), Solaris(Sun Unix), VMS(DEC minicomputers), Linux(various and sundry versions), FTX (Stratus Unix), OS2, and all of the various Windows incarnations. I'm reasonably sure I left some out. Each had it's own strengths and weaknesses. Some were extraordinarily resiliant, for instance, you could pull a motherboard out of a Stratus box running VOS or FTX and the box just kept on running. AIX was an excellent Unix in many ways. VMS was an uptime freight-train. MPE-V was doing some really cool things with networking that I absolutely loved as an administrator. I recall logging into an AIX box once that had 5 years(!!!) worth of uptime when I was asked to take over support of it. I really hated having to patch that box the first time. No version of MS-Windows has ever had any kind of reliability. For quite a while Windows (I think it was XP) had a bug where the system would hang with a BSOD after about 50 days. It was a hard stop, every single time even if the system was doing nothing for that entire time. It took ages for them to even uncover the bug because the systems were generally so unstable anyway. Every version of MS-Windows has been a virus-magnet, and until Windows 7 or so, always seemed to have security as a bolted on afterthought.
If your computer is a toy that you like playing games with, I'm sure it's fine. Some of us want to do actual work with our computers though.