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!
How big of a group are you looking for?
mikeburnfire is pretty fun.
Most of the videos consists of two friends, Mike and Zack, playing modded Bethesda games. Their main gimmick is that they are playing games like Fallout NV in "multiplayer" but they also play other stuff (Mass Effect, Inscription, Stray to name a few).
Lot's of military stories, some great gun rants from Zack and a general feeling of just two friends having adventures together.
Over six years of content and still going strong.
Any size group is good! Thanks for the suggestion - sounds good. I'll give them a try :)
I also completely forgot to mention another duo - Chip & Ironicus.
This one is a little different as they record their commentary over premade footage. They can also be a bit more… low energy (?) compared to many bigger channels but if there's one thing they (or more specifically Chip) really shine in, is the huge amount of effort put into each and every playthrough.
Pretty much every episode is released in two versions, cut and uncut commentary, to let you choose whether you want the option to focus during cutscenes etc. They are also filled with cool trivia, secrets and just good skill level in general.
They have a pretty legendary MGSV LP where Chip prepared 3 seperate playthroughs, each with a different approach (stealth, combat and goofy).
Besides that, they also have stream recordings with live commentary, a podcast and regular charity streams.
Chip worked at recently closed Volition so he could definitely use more views.