I think Fogus was able to summarize it quite well in his "Six works of Computer Science-Fiction" blog post [0]:
"Wirth’s magnum opus is the quintessential example of Computer Science alternative-history world-building."
Note that Oberon was not only the name of a programming language, it was also the name of an innovative (at that time) operating system.
It is possible to program real-world programs today in Oberon depending on the used implementation. For example oberonc [1] is a compiler targeting the JVM and allows you to leverage the JVM ecosystem by invoking Java code (or any other language that compiles to Java bytecode).
For more Oberon implementations see [2]
"Wirth’s magnum opus is the quintessential example of Computer Science alternative-history world-building."
Note that Oberon was not only the name of a programming language, it was also the name of an innovative (at that time) operating system. It is possible to program real-world programs today in Oberon depending on the used implementation. For example oberonc [1] is a compiler targeting the JVM and allows you to leverage the JVM ecosystem by invoking Java code (or any other language that compiles to Java bytecode). For more Oberon implementations see [2]
[0] http://blog.fogus.me/2015/04/27/six-works-of-computer-scienc...
[1] https://github.com/lboasso/oberonc
[2] http://oberon07.com/compilers.xhtml