Usage patterns
〈物〉が駄作に終わるfor a work to end up being a flop
It was a movie I had high hopes for, but it ended up being a total flop.
〈物〉を駄作と評するto criticize a work as trash
Critics dismissed the novel as trash.
駄作を作るto produce a lousy work
Even that director occasionally puts out a bad movie.
〈物〉が駄作扱いされるfor a work to be dismissed as trash
It was dismissed as junk at the time, but it's highly regarded now.