My opinion: It's complicated compared to what it offers. In all honesty, I was testing all these combinations when I initially did the design many years ago, and transparency seemed less attractive for dropdowns, and certainly doesn't provide any functional advantage. You need to remember, when you have transparent elements that are over other transparent items, you will get a mesh of transparent items on top of each other.
I think even when you tested properly, you might even agree ...
You think this looks nice?
ed_f wrote:Navigation Background is set to clear with #a4a4a4
I'm actually not sure where you have that ... You semi-transparent background on the intro page is actually rgba(0,0,0,0.5) ... you will need to assign CSS for intro pages (when the BG is semi-transparent) AND for cases when is #2e2e2e (I can't see anywhere it's #a4a4a4). In this case it gets complicated yes.
For example, your non-intro page looks like this. As you can see, the slightly darker shade of the dropdown and hovered menu item, gives a darker shade than the rest of the menu, which gives it a nice emphasis.
So if you want dropdowns the same colors, there is no contrast between the active item. Surely nobody can find this more productive or attractive?
I have been through this entire through process when I initially designed everything.