There is very little left over as positive income. Maybe 10% if you are lucky, which makes up a little for the huge headaches. It can be really bad if you get bad renters. You get some back as equity over time and that is nice, unless the housing market crashes.
As for evicting people, it sucks. Once you start eviction you are stuck paying someone else's mortgage. In fact you are also paying to evict them too. Some renters go from house to house just paying a deposit and first month's rent then sitting on the house for as long as possible. If you try to be nice to them and give them more time they will bankrupt you.
In the meantime they are actively trashing the house, peeing on walls, keeping dogs in the fireplace like it's a kennel without cleaning it for months, putting holes in walls, flooding bathrooms, and spreading feces inside wall spaces. Then when you finally get them out by offering to give them back their deposit (Cheaper than eviction) they move in next door and trash the next poor landlord's place.
If you are doing background checks and credit checks you can keep the above from happening for 95% of cases. However the moment you start being nice and renting to that poor family on section 8 funding because "Someone has to" you are back cleaning poop out of your walls after paying their mortgage for 6 months and being called a "Slum Lord" because the people you rented to have trashed the pristine house you put hundreds of hours into.