I've tried it. It's bit useless unless you have few guys with you. It's too slow. As it is now most of the time you have barely enough time to turn around when you hear a cav coming. With long pike I never managed to land any hits on horses. Also the normal pike (yeah I know it's renamed but it's always a pike to me) is somewhat usefull in melee too. Long pike is so slow that after you manage to block a hit you dont even have a change to try to hit yourself.
Yeah, the long spear you can melee in 1 v 1 combat so if you aren't always using teamwork it is better.
BUT I LOVE THE PIKE, even though it can not kill in 1 v 1 fights (you can't damage anyone within 2.5 feet of you. 2 feet closest to you it will probably ghost right through them, the next half foot glancing. Which means any 1h (most 2h,short weapons, etc) in range of hitting you, you can't do damage to them. I LIKE THAT. Also, If they block the pike they can kill you before you can block. The stun on the thrust is so long that they can 95% of he time hit you before you can block if you DO manage to stab the enemy in a 1v1 and he blocks it. lol 68 speed.
I prefer the long, slow, poke only, low damage, unable-to-1v1 Pike. because I use teamwork at all times possible.
*side note: last night I had a 5 hour streak of x5 on NA siege & battle. Teamwork won in terrifying ways.