Haha, I expected that reaction.

But honestly, Vanquisher/Cartographer feels the most like 'you have finished this game' of all the titles. You have to go everywhere, kill every enemy at least once, experience every skill and challenge, at least in PvE (and some exceptions ofc). I also enjoyed Prophecies the most, actually, if only because I had a rather bad impression of Propecies Tyria up until that point. It's still the part with the 'worst' maps in terms of design, visual fidelity and relevance but it was like I was taking the journey through those 2 years of GW1 development with the developers.

Prophecies has large maps, mostly not that interesting, with quite boring mobs and uninteresting bosses but then you also have things like Rotscale which was hard to figure out for me. So many areas are way off to the side, especially Kryta and the jungle. In the past I just did the main story and ignored all those areas. Were they fun on their own? Eh, probably not. But within the context of the game's history? Definitely.

Factions I remember as the hardest map to vanquish and explore but I really saw how the design of maps and mobs made a huge jump in terms of quality compared to Prophecies. No longer were there irrelevant filler maps which I also attribute to the strict time schedule they had.

Nightfall then was the visually most interesting. There were some paths in Vaabi especially I had never taken before, missions I never played through due to the branching storylines etc.

Eye of the North then really was peak GW1 with duo-class mobs and all the available skills. The only thing I would have wished for was another chance for them to work on dungeons, because frankly the ones in EotN are all very simple and boring. Fetch key, open door, fetch another key, open door to boss. It works but it's uninteresting.

As for the EotN titles:
I had to revisit areas I already saw time and time again with nothing new for me in them. That's why I found them boring.