Yeah, chicken heart and beef heart are the kind of thing I'll eat at a restaurant where I know they don't fuck it up. In my own kitchen I know my limitations.I don't like most organ meat but skewered chicken hearts like they serve in rodizio restaurants are really good if done just right. I've never been able to do them myself because it's literally seconds between not quite done and rubbery overcooked shit. I've never been able to get into liver either, it just tastes like what it is, an organ that filters toxic shit and concentrates it.
Chicken hearts are also good yakitori style.
I've had southern-fried beef liver I liked, but mostly because it was so drowned in fried onions, bacon, and gravy that you couldn't really tell what was under there anymore.