It's only slightly less durable than a contemptor dreadnought and for less points while being more killy against infantry and you occasionally see contemptors getting shuffled around.

It could always be shoved in a dreadclaw in order to close quickly into a place where it can do some damage. Even if the dreadclaw gets blown up the Assault Vehicle rule specifies that the dreadnought could still charge on the following turn.
Im not familiar with how the Dreadclaw works. Is it the one that lets you deepstrike down and then assult out of it in the same turn?
And if yes, how expensive would it then be to erase the single MEQ unit you would most likely be allowed to reach before the shooting started?