Though I guess the real answer is that in mid-game you use them to supplement early game units, and in late game you drop them on people in drop pods as a harasser.
Box bois! I love dreads. Honestly, it depends on how you wanna use then. You can convert them into more ranged armor, but it's funny if you keep the more melee focused and just watch them lumber up to people and fling them around.
Personally, i like them as Frontline melee and use my marines as ranged versatile dps (and predators and whirlwind for fire support) while the dreads soak the damage and go to town.
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https://www.twitch.tv/videos/1549897656
Though I guess the real answer is that in mid-game you use them to supplement early game units, and in late game you drop them on people in drop pods as a harasser.