Orlando is one of those places like Las Vegas, great to visit, not bad to spend and extended temporary residence, not a place you want to live for an extended period of time.
Over time the heat, humidity, cockroaches, and underlying poverty get to wear on people.
Unlike a Lincoln or Norman though it is a place built on entertainment, on enjoyment. It has things to do, places to go, and a lot of other people there looking to have a good time.
The sketchy places you mention are because the entire tourist industry is based on a workforce of low skilled workers who are in limited income jobs without a lot of prospects to advance into higher paying positions. It also is a place that has has attracted a lot of the people who tend to migrate from job to job and place to place and don't have the kind of family and roots that stabilize communities.