[Big Dave]

For many people, minimum acceptable acceleration depends on the size of the vehicle. The issue is not so much real safety but the perceived safety. Being in a small slow vehicle makes people feel helpless and vulnerable.

A motorcycle depends on acceleration to control his position in traffic. A truck is bigger so needs positional control rather less.

My take:
Motorcycles: 3-6 seconds 0-60
Subcompact: 10-12 seconds
Big sedans: 12-14 seconds
One-ton pickups: 14-17 seconds

Over 17 seconds 0-60 you better be a Class 7 truck.