I'm getting married in October and my fiance and I are going to Argentina for our Honeymoon! We are planning to go for about two weeks (12 days) and had already accumulated suggestions on where to go but weren't sure if it was too aggressive or not.

We were thinking of something like this:
BA - 2-3 days
Iguazu - 1-2 days
Mendoza - 3-5 days
Patagonia - 2-3 days

If this is too aggressive, what would you suggest are the best places to go?

Congratulations !
An excellent honeymood destination ..

If I were doing this .. I would stay in BA longer, stay one night/2 days in Iguazu and decide if Mendoza is neccesary.. and yes to Patagonia.

So ..
5 days BA
2 days Iguazu
5 days Patagonia

or something like that.
Where are you thinking of staying in BA?

lol, and an excellent honeymoon destination too

I have to agree with more time in BsAs.

Go tango, it might be romantic, and at the very least, erotic.

As for the rest of the days, it will all depend on your preferences.

It seems that you have an interest in wine, hence the listing of more days in Mendoza than BsAs.

You have plenty of time. Get a few books, including a book on Argentine wine. From there you can start narrowing your trip down.

We actually haven't thought at all about where we are going to stay. First step is just figuring out which places we want to go!