They got a recording contract with EMI without Ringo and the US version of Love Me Do was a platinum selling single with Andy White playing drums, instead of Ringo, but his vocals on the singles Yellow Submarine and to a lesser extent Matchbox and Act Naturally are iconic. He attracted a fan demographic that they otherwise would not have had. On the other hand, we may never have heard of the Beatles, if it wasn't for Pete Best because of his connection to the Cavern Club and his availability as a drummer to travel to Hamburg. George was singing an equal number of songs as Lennon and McCartney before EMI so they may not have made it to EMI without George, but he didn't have a hit single until 1969's Something. His harmony vocals and guitar playing certainly helped with their sound. His Indian music was unique and popular , and he certainly attracted a demographic they otherwise wouldn't have had. He seems to have the most popular Beatles song now, Here Comes the Sun, so he might be one of the driving forces of their present day popularity.