Although in 0 A.D. pikes are visibly longer than spears, they're represented shorter than the were in reality. When zooming in, it seems 0 A.D.'s pikes are about twice as long as the men:
Let's say a man is 1.8 m tall, then these pikes are 3.6 m. We know from Hellenistic authors pike length varied over time (I posted a summary in this post), but even the shortest (4.8 m) were a third longer than 0 A.D.'s, and the longest (7.68 m) over twice as long.
I vaguely recall humans being about 4 Blender units tall (@Stan`?), so I guess the current pikes are 8 Blender units. It would be great if someone could create longer pikes, preferably four sizes: 10, 12, 14, 16 Blender units. Or, to put it differently, 25%, 50%, 75%, and 100% longer than the current version.
And another thing. When playing around a bit with the syntagma formation, the pikemen in the front rows seem to physically bend (@Alexandermb); this is wrong: in reality the men should stand upright, holding their pikes horizontal. Lowering your back means you occupy more space, and the idea of the syntagma (‘square’: 16×16) is its closed-packedness. Furthermore, actually the first five or six rows held their pikes horizontal, the men in the rows behind them at angles of c. 45°: