I don't have a problem with black wheels in general, it's how it's done. As with any trend, there will be half [censored] versions of it.
A lot of OE black wheels and even some aftermarket black wheels look perfectly fine.
Cheapo wheels look bad regardless of color/finish, and spray painting factory wheels black usually turns out bad.
I think it's funny when there is a car or truck for sale on CL with factory wheels rattle canned black, and it's advertised as having "custom rims."