That is, the West is genuinely DISAPPOINTED with Russia.
Most certainly yes, a lot of Poles of high stature and less betted on Russia for a myriad of reasons. It's own defeat in ww1 were a disappointment for many (especially those of pro-Slavic leanings). The west didn't conclude as such since Lenin took over shortly and the Soviet Union was seen as hope of the workers worldwide. Yet the Soviet Union was seen as a caricature of what Russia had been and could never come back to the world stage on it's own.
Situation changed back and forth, yet very few saw the Soviet Union as a ideal, or a power to strive after or be inspired by. (In comparison to many Poles being inspired by the greatness of Tsarist Russia)
Many were depressed and saw no way out of the iron curtain until 1980's.
The west in general didn't get to be as disappointed or losing faith in Russia as a co-partner and a stable state in a region of instability until 1956 (Hungarian revolt) 1968 (Czechoslovak invasion), invasion of Afganistan. Dissolution of the Soviet Union, apparent passivity towards dissolution of Yugoslavia, conflict with Chechens, Georgians, Crimea then finally the nail in the coffin. Invasion of Ukraine.
Before invasion of Ukraine there were still British Moscow correspondents on Polish-Belarus border painting a dark situation about the migrants trying to cross the border. It all changed after that, people had enough of Russian told stories, ears were shut and hate spread.