Given a decent team (or really just a small group of good players in TS with you), it's pretty easy to rack up huge scores as a pikeman. Go 21/18, max out your polearm proficiency (to help reduce thrust stun; alternatively stick 80-100 wpf in 1h as a sidearm), and just stick with players you know.
Stab people who aren't downblocking. Stab horses. Try not to stab teammates.