I think Linux is a great thing, because Linux is an alternative to Windows, and because, of all the operating systems that are at all relevant today, Unix is the best of a bad lot.
I think the major good idea in Unix was its clean and simple interface: open, close, read, and write.
UNIX is basically a simple operating system, but you have to be a genius to understand the simplicity.
C was already implemented on several quite different machines and OSs, Unix was already being distributed on the PDP-11, but the portability of the whole system was new.
For the first time, individual hackers could afford to have home machines comparable in power and storage capacity to the minicomputers of ten years earlier - Unix engines capable of supporting a full development environment and talking to the Internet.
In early 1993, a hostile observer might have had grounds for thinking that the Unix story was almost played out, and with it the fortunes of the hacker tribe.
If Unix could present the same face, the same capabilities, on machines of many different types, it could serve as a common software environment for all of them.
I got tired of people complaining that it was too hard to use UNIX because the editor was too complicated.
If you have any trouble sounding condescending, find a Unix user to show you how it's done.