I have yet to see Bloodline or Inferno, but Hell on Earth is the worst of the first three Hellraiser movies. It lacks both the wit and the sheer terror of the first two films. What's more, it breaks the rules established in the previous Hellraiser films (that is, Cenobites cannot harm the truly innocent, the Cenobites can be summoned or banished by the box, and so on). And while Pinhead actually spoke very little in the first two films, in Hell on Earth he is downright talky. Unfortunately, only a few of his lines are very memorable. It is unfortunate that Clive Barker did not have more to do with this movie (he wrote and directed the first and wrote the story for the second), as it might have turned out much better.
Review of Hellraiser III: Hell on Earth
