This discussion arose in the forums back in 2009. Players are diffrent, and like different things. They have open world pvp and they have instanced pvp.
If you were expecting everyone on the same map from lvl 1 I am truly sorry for you. The game just released and not everyone has reached open world encounters. My first was a couple of hours ago in Aldreraan.
My suggestion is to wait to 50 and then comment on the lack of open world pvp.