Do you a want any changes to WvW? If so what and why?
For me, I want more important objectives that I can do to contribute to the battle outside of Zergs and Roaming that can also be rewarding. Right now I feel the best rewards and most fun is large zerg fights, but most of the time it's just player vs door to empty structure with a boss that dies like nothing.
What I would change is how those NPC faction units work and make it something bigger and more effort to accomplish summoning them. Would have different unit types as well.