A few ideas about how to improve the state of wvw:
Walls and Siege – No longer give participation and xp
The reason behind this is to prevent the current influx of peope that are there only to farm pips for rewards. These people stand around afk until a wall is broken and then repair them to get xp etc. These are also the same people that randomly throw down siege in stupid places and build them for xp.
Free Accounts
At present free accounts can enter WvW at level 60 and dont have full skills, traits etc so already provide an easy kill for level 80 players. These player also are made with the intention of being active on an enemy server to waste supplies etc. These account should not be allowed to enter WvW when in free and should only be allowed once they have purchased the full game. They should however be allowed to enter and play eotm as this would let them have a taster of wvw environment without actually affecting the gameplay.
Server Linkings
If a high placed server is linked to a low placed server then the low placed server transfer cost should be the same as the high placed server to prevent server stacking for that matchup. The same applies if the high server is showing as full then the lower server should also temporarily be placed as full until next linkings.
Outnumbered
Reduce the pips to 3 as 5 is currently to many and if you enter the map with less than 5 mins remaining then you cannot score pips until the next full 5 mins.
Map Hopping
To prevent players moving from map to map in order to get the outnumbered buff benefits the participation level should be reduced back to 0 when you change map. Now I know sometimes you have to jump maps to defend structures, however it is easy to get to level 3 anyways and at the most your only gonna miss 1 lot of rewards.
AFK at Spawn
Now we have all seen people afk at spawn waiting for their pips to run down and taking up space that another player could enter and use or waiting at spawn until they need to go and flip a camp in order to keep their participation level up.
When players are at spawn they have the determined icon placed on them. When this icon is placed on player then they cannot recieve pips. This prevents players afking at spawn. Now those that afk in a structure we cant really prevent, however if that structure is flipped they will be killed and after 5 mins will be ported to spawn anyways at which point the determined kicks in and no pips recieved.
Logging off Pips
Ok, so you decide to call it a day and you can probably squeeze out another 15 mins worth of pips but doing so prevents others from joining, why not simply have an option to consume all and provide pips based on this.