i jump allot in pvp... and pve for that matter. someone once told me its a habbit from fps games...
as for the running around in circles... this certainly helps allot. possitioning in a pvp mmo for rear attacks is important... rear is not always 180 degrees rear... its 45 degrees... so running around can give u that 1 degree all the time. to counter this u walk backwards and try and face the opponent (esp for tanks or defense)..
anyhow my 2 sents.
this game is no exception from wow, war, daoc, aoc etc etc imo