It’s probably because the only major races with a real army are in massive debt.
It’s a stated fact that the sylvari as a whole are immune to any dragon corruption (not just Zhaitan) . Rather than being corrupted, they simply die and stay dead.
I play my elementalist with a 300-400 ping, because I tether from my phone. I can do PvE fine, but dodging is difficult. I’ve actually played with a far worse ping (around 850 or so) and I can say that it becomes very difficult to not die. I really hate my internet options.
Technically speaking, the asura would be the most powerful. They have golems – troops that do not cause actual casualties when they are destoyed, just economic loss. And on economic terms, they are very, very far ahead of the other races, as they control the primary form of transport (Asura gates), and haven’t been locked in a thousand year war like the humans and charr, the only other races that have an organized government that uses money. On top of that, their capital, Rata Sum, flies, making it very defensible.