gunkulator
Emperor
Just finished a game as HRE and I have to say that Landsknecht are pretty awesome especially as a defensive unit and you shouldn't underestimate defense especially when you take into account Siege Weapons. Most battles feature cities being attacked and attack strength is not very important since catapults/trebuchets reduce opposing strength to the point that the attacking unit's strength is not very relevant. What is relevant is the the unit's defensive ability during counterattacks and this is where the HRE UU shines.
How many defensive units do you really need? A single Landsknecht may do the job of a pikeman and a crossbow but you'll probably never need to build more than a few. In the end they don't save that many hammers.