They aren't as useful as you may think with the bleeding effect because it does only 1% damage and you may think that when it stacks 5 times it is as good as ravager but after all it does only 1,5% damage when all 5 bleeding effects applied. He does more damage by just biting than by the bleeding.

But wait, the Deinonychus is pretty good against players on PvP servers because

of their leap, it has a very good tracking on players. You can just jump and easily kill the player.

Hope this helps.