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!
If you like Game Grumps, maybe check out Oney Plays.
Will do! Thank you for the suggestion :) I hadn't heard of them before.