I am quite curious because I am thinking of starting a minecraft lets play series.
What makes a minecraft lets play entertaining to youtubers?
A personality I guess, think up some good topics to talk about before you start recording.
There's way too many minecraft youtubers out there to get away with just playing, maybe play with some cool mods.
Alternatively, go full retard like Tobuscus/pewdypie and hope to get people who watch MLP to latch on
Setting up a narrative for what you are doing and why, and just be a likable person in general. Like, there is no fun in watching any old fool just mining rock and building another house on the beach. But if you set up a story/purpose for what you are doing and keep the action fairly well paced "through the magic of editing" then there is totally room for some interest.
Play multiplayer with people you have good chemistry with. Avoid private jokes that make sense to you and your friends but not viewers. Actually have fun, its really boring and frustrating to watch someone continue playing while they're bored and frustrated. Feel free to cheat if it's in service of fun and a more entertaining video. That was mostly what not to do but I hope it helps.
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