I know you said in game preferably, but I do think it’s worth giving a shout out to Nobbel on YouTube; his lore videos are really engaging and thorough, and you can often find videos on specific topics (like the story of Sylvanas) where he compiles history from several sources into a video. It’s worth a look if you’re really interested in the lore, because for better or worse the game itself sometimes only touches on events that have more depth in other sources.
Anything that doesn’t conform neatly to their views is bias. My parents were like that when I was growing up; Rush Limbaugh and Focus on the Family all day on the radio, then my dad would watch the evening news and bitch about how biased it was. Completely nuts.