For the last few weeks (maybe four) it has been Gandara vs. Piken Square vs. Augury Rock.
A server limbo due to the even match ups. Our points have been relatively close, with only a clear victor usually towards the end of the week, and usually not the same. For all intents and purposes, this is the ideal match-up.
It's not that the point tallies remained even, but a constant tug and pull where one server would dominate for a short while before falling.
I've been present at all Resets, and this has never happened. Sure, one server would dominate, but not to this severity (and often it was AR).
Why the change?
Server hopping is the largest culprit. A relatively large guild switched from Gandara to Piken this week, and the effect is demonstrated above. (i'm only aware of one guild, it could have been more, or WvW guilds left the other servers too)
You might think that I'm pointing out the obvious; if a large WvW guild switches, the balance tips and suddenly the server starts leading more. Which is okay, if you couldn't switch servers every week.
The system needs to be changed so such an imbalance happens less frequently... so a guild can't hop to one server for a short while, dominate the others, rise in ranks, and when the battles get too tough, drop down to a lower tiered server, and rinse and repeat. Essentially it's maximizing your return on loot, karma, gold, and experience by easily dominating other servers (a lot more kills and tower caps = more loot, etc...).
The easiest fix, in my opinion, is to institute the Guesting system, and charge for server changes. Guilds will be less inclined to server hop if they have to pay out of their own pocket. It won't necessarily stop it, but it would slow it drastically.
I'm from Gandara, and I accept my fate this week, and will battle as best as I can, but I am disappointed in the players and guilds that have taken advantage of the system and hope ArenaNet addresses this.
edit: Sure the new round has barely started, and this could even out over the week (especially since the guild that hopped is not a frequent presence), but you can see the immediate effect it has had, and could potentially have during the entire match if a guild had more of an active presence on the maps.