That anyone can possibly say The Beatles were overrated just defies belief for me. Perhaps not everyone's cup of tea, but in no way overrated.
They recorded 13 studio albums in an 8 year period (as a comparison, U2 have released 13 albums in 35 years). They paved the way for bands to write their own songs and along with George Martin, completely changed the way music was recorded - pushing the boundaries of the limited technology of the time. Sgt. Pepper was recorded on a 4 track!
We all know about the ridiculously productive Lennon/McCartney song writing partnership, but if we take The Beatle who was considered to be the third songwriter in the group (Harrison) and look at his best songs (say Here Comes The Sun, Something & While My Guitar Gently Weeps) they would probably stand at the top of most other bands back catalogs.
The thing is their music is so diverse that personally I struggle to see how anyone can blanket say 'I don't like their music'. Helter Skelter is about as far removed from Love Me Do as it's possible to get and that change came within 5 years (most bands these days would probably have released 2 albums in that time if they were lucky).
It's unlikely that any other band will ever have the same influence on both music and culture as the Beatles.
Anyway, my favourite Beatles song is 'For No One' (although 'Across The Universe' runs it close), and my favourite album is Revolver.