It's been explained to me elsewhere that a low verification time increases the amount of orphan blocks.
How?
Why?

Does this type of network inherently fail?
If so, why?

Are there costs associated to a cryptocoin with lots of orphan blocks?
What are they?
Why?

Are lots of orphan blocks a nuisance that clogs up miners' networks and systems, or do they actually prevent a cryptocoin from succeeding?
Why?