Examples include: Scary Game Squad, Gamegrumps, Team Double Dragon, and the like.
I just find let's plays a lot more entertaining when multiple people are playing and chatting than when it's just one person rambling. But these are weirdly hard to search for!
Worst Premade Ever (WPE)
They are British, one of their editors is from New Zealand. They threatened to replace their editors' livers with live badgers if they unionized. 10/10 would watch the surgery.