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I only had the chance to try a single tier 4 unit so far, the one you get from a quest in the dvar campaign, and honestly I wasn't impressed with that either.
The Dvar Earthcrusher is either totally underpowered.
Or primarily a strategic unit and underpowered.

The other Ultimate units do the "bubblegum and behinds" meme.
 
I think I fougred out how to use the earthcrusher. The 24 speed and tractor beam makes it seem it can not go to the enemy. But that is false.
Baron + Earthcrusher.
Baron uses it's Nitro Battery on teh Earthcrusher.
Earthcrusher now has Fast Movement and a Instan Kill attack that is a single action.

Regareding teh Sapper: The Beta now has both teh Tactical Spawn and the Vehicle with 32 Movement. So at least on teh hero it is a fast, non-large Mechnical.
You would not be able to use the Baron if you want speed, but a foreman with Recontruction Kit can at least do some repair.