PA is very regionalized so all of that varies, in terms of dilapidated buildings that depends on where, in my experience living in Central and NWPA there are some, but that's not necessarily a sign of rot, just like a lot of Rust Belt + Appalachian areas it has seen population decline over the last few decades. Great if you love nature and history. I wouldn't describe it as a bad place to live, but I honestly don't think you'll learn much from some random YT video. A lot of the cities(and even some rural areas) have quite a bit of diversity, most people in Erie are proud of our city hosting a large population of Middle Eastern refugees.