+3 estoc is 107 length, 100 speed, 32 pierce, and 30 cut. It's just a long espada with +2 pierce. Even compared to regular espada, it only has +1 cut, the same pierce, and -2 speed. For polearms, compare it to any spear.
Stabs complement swings, which is what makes the feints so tricky. When the swings are that weak, that limits some of its adaptability since it has to rely on stabs so much.