I hate to sound like a broken record however, I too only normally play in 2D. You will find that if someone grew up playing table-top war games in the 1970's, 1980's, or 1990's, they are normally playing their HPS/JTS games primarily in the 2D view.
The 2D zoom feature is really a nice feature which will help you to be able to see your units better in the 2D map view only.
The 3D view can give you a miniatures type-of-feel, especially if you are using a 3rd party mod.
We offer several NAP 3rd party mods in our Mods section for all of the HPS/JTS titles.
https://www.theblitz.club/message_boards...hp?fid=239
Playing the Demo will give you a good idea of how these games play out. These games really shine and are alot more enjoyable if you play your games against another human opponent via PBEM.
As for purchasing your first titles, we normally always suggest starting off with a title that you have a strong interest in.
As a owner of all 10 titles in the NAP series, my two favorite titles are Waterloo and Leipzig, as they have a different feel to them, in a good way. These two titles are also very popular among our members and you will have no problem finding PBEM opponents for them.
If you decide to purchase a title or two, I suggest buying the JTS version which is located here:
http://johntillersoftware.com/NapoleonicBattles.html
If you have any more questions, just ask away!