How is the rating 4.8 – Starbucks Review

I had a very bad experience with starbucks app. It hangs a lot. Bad UX ! Sometimes the screen starts flickering (brightness) and sometimes the app is just blank. I recently downloaded it and since the first day, i have faced a lot of issues - don’t know if it is specific to this version or something else.
Review by Alig_cheetah on Starbucks.