Devs are one big red flag if many of them have a bad history.
Does anyone know of reliable sources that can provide unbiased overview of limitations and potential problems that a coin and their devteam is facing?
You have to gather every information that you can. Being unbias isn't in the term of many reviewers and you can only find them rarely that provides insights that are for the sake of the people. But most of them are only giving them biased reviews and thoughts about project whether they like it or not.