The production team is basically showing their hand and saying "yeah, our goal is to make you cry every episode for the entire season". That's ambitious and I like it.
Maybe I'm just easily manipulated, but this first story got me (even with them having to take the time to establish the premise first). It could've hit harder, sure, but it (subjectively ofc) felt like a pretty promising start to me. If I have one thing to nitpick it's actually the soundtrack when she goes into town--it feels out of place? it doesn't mesh and feels frantic. It's entirely possible that it was intentional--I'm willing to trust the story for now.
I loved the cold open! It really efficiently establishes the mood, sets up the magical aspect with the single "tea brewing" shot, and shows us Meg's personality through how others (Ms. Faust and all the animals) interact with her. When people say "show, don't tell", this is what they mean.