1. Forsaken Ascension
This map is honestly so stunning, I'm surprised nobody has mentioned it yet. (It is only on the 120 player servers, and I'm not even sure if it's still playable, but the builds and terraforming are insane.)
2. La Brocanterie
Not the best for PVP, but nonetheless an amazing map. The theme of "no theme" is pretty unique, and the overhead screenshot of the whole map is just unreal looking. Again, another underrated map.
3. SG2
This map is probably one of the worst for PVP once again, but the builds are still better than a lot of maps being built today imo. It was a huge step up from SG1 too.
4. Teweran SG3
Possibly one of the most creative Cornucopias on the entire server, this map is insanely well built. (Especially when compared to TSG1 and 2, which imo mostly shined in their terraforming and unique theme.)
5. Shady Hollow
This map is less huge than the others on my list, but it's so pretty!
Anyway that's my list, pretty different than a lot on this thread haha. Sorry about the long post, and posting on a thread that hasn't been active since June btw!
Runners up would be Mockingjay, Mortal Skies, Origins Requiem, Fallen Empire and Valentines!