A couple of things PVE could really use.
1. Cross-server dungeon matchmaking.
2. Diminishing returns nerf. Make DR only happen the second time and then stay consistent till the next day.
3. Server wide scoreboard. Add a scoreboard for guild runs that shows which guild runs have the least deaths, fastest times, etc.
4. Better loot. Explorable dungeons should never reward anything less than level 80 rares to a level 80 player.
5. Tokens used as a currency for something else. Exchange it for karma, skill points, crafting materials, something besides armor and weapons.
6. Hardcore Mode. A premade group are thrown into an explorable dungeon at random and forced to take a path not of their choosing. They cannot resurrect at a waypoint during boss encounters and if at any time they are all dead, they fail. If they succeed, they get a gold, karma, and a token of Balthazaar—or something—that they can exchange for a bunch of tokens from any dungeon they want. The token of Balthazaar would be a once a day thing.
I will never play WvW until Map Completion there is removed.