Just learned something that makes Moreno Valley even worse.
Moreno Valley was a growing city until… the Base Closure and Realignment [BRAC] III Act devastated March AFB in the mid 90's. That's been all she wrote since then. Too many houses not enough good paying jobs.
Around this time (the mid 90's) during the height of the crack and gang epidemic in LA, a lot of well meaning but ultimately foolish inner city families (read black and hispanic) tried to flee to exurbs to keep their kids out of gangs. They sold their paid off houses in the inner city, places like South Central, and bought houses in places like overbuilt Moreno Valley, Victorville, Hesperia, etc. It didn't work. All they did was bring the gangs with them, and to a sleepy places will small police forces, that were woefully unprepared to handle the influx of gang members and accompanying crime, drug trafficking, etc.
Throw in a recession and the continuing transfer of units away from March (now reserve AFB.) And you have a recipe for what you have now, an overly urbanized, overbuilt, suburb full of inexpensive rentals and absentee landlords, with little industrial base.
If it wasn't for the warehouses that you lament the situation would be even worse.