They said that the elections were "a step backwards for Democracy", but they did not criticise or fault the election / voting process itself.

Accorsing to Reuters:

"The Organisation for Security and Cooperation in Europe, which sent 600 observers, called the election a “step backward” for Ukraine’s democracy. It said state resources were misused to support the ruling party and media were biased, and noted that Yanukovich’s main rival, ex-prime minister Yulia Tymoshenko, is in jail. It did not however criticise the voting itself."

https://www.reuters.com/article/uk-ukraine-election-idUKBRE89T19C20121030

Of course the Western observers' biggest criticism was the fact that Yulia Tymoshenko was in jail. She of course is the darling of the West, having led the CIA-backed "Orange Revolution".