Why Starbucks such a big deal?

Because valley girls.

Real answer, it's popular with young folk and is convenient, being one of two coffee recognizable in America
Joke answer, because people are too afraid to drink sludge. Otherwise they'd know sludge tastes better. Fuck you, Starbucks

No big deal for me, I can buy a simple cocoa milk at the convenience store.

Never tried it though I have always been pretty curious myself. Will get back to you once I do !!!!

I honestly don't know. I personally like their items, but it's all so pricey. But in Canada, Starbucks isn't that big of a deal over here cause we got Tim Hortons 😎