"Over performing on some map" the problem is the map no the unit
(Can be said for every unit)
I'll correct that to one type of map. There's essentially not anything wrong with most of these maps, and essentially not anything wrong with the JT - just that with the JT's late game impact this causes problems. The same cannot be said of every unit, I can't think of any really that has this specific problem with the same lack of counterplay except for the sim city commander, which we all hate.