Minecraft

Voltz Wars is basically about various conflicts that happen between the various factions, with mods like ICBM providing interesting missiles and CustomNPCs allowing for a living population other than the YouTubers themselves starting around Season 4. The best parts start with Season 3, in my opinion, where there is interesting mystique following a new antagonist one of the groups accidentally created. There are some later spinoff series that are connected to the old ones in interesting ways as well, like Magic Wars.