As someone who lives, and walks daily in a large city, I have really enjoyed the urban micros that I have found! I luckily live in the only large N.American city without a Walmart, so I don't have to worry about the notorious Wally's micros.
All of the micros I've found, or that are on my to-do list are in small parks, historical areas, waterfront piers, etc... Worthy places where 'the container fits the area'. I always enjoy reading the logs from tourists who were able to enjoy our beautiful city by going to the spots that people who live here think they should see.
It comes down to just following the same rules that are suggested for EVERY cache... find a worthy spot, use the right container. Then we'll all be happy cachers.