I only speak for myself but as a longstanding member of the party, I have never heard any LibDem member say such a thing, although some voters were not happy.
This was the first peacetime coalition so not something people were used to and many Libdems would have preferred a coalition with the Labour Party. Unfortunately the numbers did not add up .
Nick Clegg put country before party and although mistakes were made, I think that now we've seen an unrestrained Tory government, most people realise what a difference the LibDems made.