I used CDC computers 1986-92. They sucked, and CDC employees could not comprehend that they sucked. They had convinced themselves that their alternate universe was real.
What...you didn't like NOS/VE?
The 180/990 and the 205 were a pretty good FORTRAN vector machines if that was the problem you wanted to solve; the compiler was quite good. The other 170/180s were...for everything else...not so much. That boat had sailed.
That was many, many years after Cray had left. By the 80s, CDC was a shell of its former self.