Why স্টারবাক্স্‌ such a big deal?

Because valley girls.

Real answer, it's জনপ্রিয় 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, স্টারবাক্স্‌

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

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

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