This is the second time SLB has given music to his movie (first was Guzaarish). SLB is well known as a very demanding artist, with very high expectations. His previous movies (Khamoshi, Devdas, Black, Hum Dil De Chuke Sanam, Saawariya, Guzaarish) have all been musically oriented. SLB, like other veteran directors of Bollywood (Raj Kapoor, V. Shantaram, Yash Raj Chopra, BR Chopra) is well known for his fine taste in music.
Music of Ram Leela is one of the finest creations of Bollywood. I listened to each and every song several times, and each of the songs "grows on you", when you listen again and again.
I can not list the worst song from Ram Leela, since there is none to belong to this category. It will a sheer insult to SLB to call one of his master creations "worst".