re: Do we as a country suck at solving murders, or are detectives under qualified?

Murders in low economic areas are extremely tough to solve and usually are the majority of those unsolved cases.

This is for several reasons. They don't trust police and aren't as cooperative, which leads to slower reaction time and less effort on the part of cops. Also it often happens during other illegal activity with unregistered weapons and leaves behind very little evidence.

There aren't a lot of murders in the suburbs and country clubs going unsolved.



ETA:

Without confessions or great evidence like video or something, it is often extremely hard to convict or even charge people of murder.