It's a PITA. You can make real money at it if you own multiple properties. One bad tenant can fuck over your entire year tho.
My aunt and uncle had a few properties out in Woodstock and Marengo for a long time. They were definitely "slumlords" - most (or all?) of their tenants were Section-8. The income they got from it was reasonably healthy, even with the PITA-ness of it. But they had 3 properties, 2 of which were multi-unit dwellings, which helped. It's really a #'s game.
I remember spending summers with them on their farm, and on the weekends my cousins and I were dropped off at the various properties to do maintenance. I also remember doing lots of "move out inspections", they had a lot of churn. We always had to replace carpet.... for some reason, section-8 people like to piss on carpet for some reason. The units were dumps to begin with but they were always TRASHED when the tenant moved out.
So long as you're handy AND have a free supply of manual labor (10-14 year olds work best) it's a way to make a few bucks a month.