I agree with the spirit of your post but these are bad examples. Baldur's Gate wasn't Bioware's first game and the first game in The Witcher series wasn't exactly received as a masterpiece.
Single Player RPGs and Minecraft style games can easily be simple enough to develop with a small team. So when people are criticizing the size of the team and lack of experience of that tiny team, it has to be taken in context with the type of game they are trying to develop.
What's more important than game industry experience is game dev experience or even software experience in general. Even if that experience is as a hobbyist, it can make a big difference in my confidence level for a project. So my questions would be, what did these guys do before now, what kinds of projects have they worked on, etc.