The Coalition is "not a happy family" and there is a "shitload of room for improvement" say government MPs, who confess to being in the dark regarding the future of the government's controversial GP co-payment and a mooted cabinet re-shuffle, because those decisions are centralised in the Prime Minister's office.

"We are not all a happy family ... you're going to have to ask people outside the backbench what's happening with any of the policy decisions, because there is very little inclusion," said one disgruntled backbencher.

"We usually read about it in the papers. Is there resentment? Of course there is."

A wide survey of Coalition MPs by Fairfax Media revealed a mixture of anger, disappointment and loyalty in response to questions about the recent outbreak of grumbling among government members, with Treasurer Joe Hockey a particular target.