dunno much about mods. I just think those are probably the most dominating UU's in the game and, as such, the most fun. Legionairres are nearly unkillable, MW are fast and tough, war chariots are fast and available really early and immortals are the best offense in the game before... knights? are there longbows in vanilla?
riders are really fast and industrious is a pretty killer trait in vanilla - but they do require building an empire...