Ship Counting Squad system wasn't used only in HW2 - it was also seen in Haegemonia and Dawn of War. Last one was also Relic's doing, and I liked it more then StarCraft, for example. One of the things I liked there was squad improvements: like space marine squad could be converted to tank busters, shootah boyz, heavy unit killers and so on. Along this, squads could have a hero: create a mighty unit - something WarCraft3 influenced - and then just add it to the squad as an addition. Or make a sergeant. This way, quite weak squad of imperial guardsmen, for example, could be turned into something you need to be aware of. Like in real life - you have basic squad of 8 men (NATO standard), but it can be enforced by machinegunner, grenade launcher guy etc., increased its number to 12 or more - depending on the tasks to execute. As we see, we can count ships in HW in three ways - it's quite interesting how HW series inside itself has turned into genre experimental lab - by unit, by SU, by squa