My take on scandals in general: there is usually something there that is reasonably adequate enough for partisan opponents to be suspicious and in some cases, convinced. I can spend a lot of time digging deeper but why exactly would I spend my time on this? I'm not a partisan trying to get one over the other party. I already believe that corruption is rampant. I would gain nothing by investing a bunch of time on this, especially when there is a good chance I would never be totally sure where the truth actually lies.
If you asked me before any of these stories about the Trumps/Bidens if they had anything shady going on, I would say "probably" and my answer today is still "probably".