Music is music. Beauty is in the ear of the beholder. Trying to make the claim that The Beatles are inferior musically to other kinds of music is absurd. There are excellent and accomplished bands in every genre.
Now, what is not a matter of opinion is the fact that The Beatles have thus far stood the test of time. They're still one of the top selling acts of all time, including being the top selling band of 2009 due to the remastered catalogue. We can debate all day and all night about individual taste, but that's a purely subjective discussion that can have no resolution. But there is NO debate when it comes to their popularity, their continuing value as a product, their overall artistic merit and the influence they've had on the entire popular music genre. Attempting to suggest that The Beatles are not relevant to a modern audience is a losing battle.