According to
this Wikipedia article, the average adult running speed over short distances (200 meters or less) is about 10 m/sec, which means that the listed number in the book (25/Turn = ~8m/sec) is actually a little slow. When you consider that this movement still allows for things like shooting guns, casting spells, etc., it doesn't look that bad.
This one says that the average walking speed is about 5 km/hour. The rules put the walking speed at 12 km/hour, which means that accurately reflecting how people really walk would require changing the walking speed to a 4. (Dwarfs would get a 3, trolls would have 6.) Even
power-walking has an average speed of 8 km/hour; for an accurate reflection, human/elf/orc walking speed would have to be reduced to 7.
So, yeah, just taking RAW, metahumans walk
REALLY fast. I mean, joggers can't keep up with 'em.