I would agree to an extent just because not everything they wrote was good... I'd say a good 30% of their music isn't well received just from being to experimental or just straight up boring. But when you look at each of them idividually, even though lennon was a fucking shit human being and he soils a lot of the beatles for me just 'cause of that, they were all fucking incredible musicians, paul and ringo still are. They set a standard, especially for their time.

Lennon has such a powerful soulful voice and being able to be well rounded enough to play multiple instruments and convey the sound you're going for made writing more natural. when you combine Lennon, sir Paul and his even more amazing ability with music and multiple instruments, Good ol' george and HIS singing and guitar playing and Ringo's singing and very solid and pocket style drumming it's hard to deny the huge amount of talent they all had and the extremely popular music they made and the impact it STILL HAS.