Yep. Moreno Valley is a s-hole. Has been that way for 30+years.
Before MV existed, the unincorporated area was called Edgemont. Mostly farm land, with some small trailer parks and mom & pop motels along Highway 395 (now the 215 freeway.)
Once the track went away, and the low buck tract houses & apartments were built, it turned to crap. Brett sums it up correctly.
As far as the final days of RIR itself:
I have a piece of the asphalt race track surface from near the start/finish area.
Chevrolet & Pontiac gave out "last laps of Riverside" swag at their press co-event shortly before closure. I have some of that.
Want to take a guess at the car company that had the very last press event on RIR?
Nope, nope...nope.
Answer provided after some more guesses. I'll bet no one nails it. Google cheating not allowed.