PVP, particularly world PVP has been complete garbage in WoW for years now. Other games make an attempt to make world PVP actually fun and meaningful, and also try to balance opposing sides as much as possible.
Unfortunately most servers in WoW are now very imbalanced towards one side or another. There are very few "balanced" servers. Like Blizzard said most of the 'so called' world-PVPers like to transfer to servers where their own faction dominate. Ironically this results in little to no world PVP because the underdog faction eventually gives up and transfer away it resulting in even more imbalance.
And as usual Blizzard is not offering any solutions other than 'paid transfers' of course. Before any of you bring up Connected Realms they are only merging low-pop realms. However usually the most lopsided of imbalanced servers also happen to be High/Full ones (e.g. Illidan, Sargeras), and not the targets of Connected Realms.