I'm a complete newby at Geaocaching (started on the weekend and we found 4 didn't find 2), but as a newly starting out family with 3 young children I think it would be handy that if you set a micro somwhere, that the hint is very specific.
I found this hobby just last week, and thought it would be a fabulous way to enthuse my children (aged 6, 3 and just 5 months) a bit more when we're spending time outdoors walking, exploring, and taking road trips. However, I think the novelty will soon wear off if they are continually disapointed about not being able to find the cache.