Television Remakes: Do they succeed or fail most often?

There has been a long history of remaking television, typically UK television, and remaking/adapting it for new audiences. UK television series like Broadchuch and House of Cards (1990) have been remade for American audiences as Gracepoint (2014) and House of Cards (2013). In what ways does the remake fail or succeed? Is the remake necessary for producing quality television?