I think maybe the issue some folks have with the dreadnought is that it doesn't necessarily have as clear cut a "best use" that other units have. Just what is the dreadnought's "best use"? What is it better at than any other unit?
The common suggestion of adding a second combat die that is removed when it sustains damage it a pretty neat-o suggestion. As is giving them a small capacity (e.g. 2) that is increased by 1 with stasis capsules.
I'm not sure either or both is necessary or even answers the question, "If I need to do X, a dreadnought is the best answer."
I'm assuming its a non-fighter ship possibly non-destroyer?