We should remember also that Charli's early stuff was made when she was 16, so that explains why the quality of her music improved so much between the first three songs and the last three songs.
Is "Lights" really the best Ellie Goulding can offer? If so she deserves some punching.
Her best is The Writer. Lights stays overrated trash that didn't deserve Top 10 in the Hot Dance Club Play Bubbling Under chart, never mind the Hot 100.