If you're trying to say that John was more charismatic, I'll have to give you that. But I'm not sure if that has a lot to do with musical talent.
It has nothing whatsoever to do with musical talent. Ringo was probably the most charismatic of the four, but he's probably at the bottom of most people's lists. Ever heard Van Morrison interviewed? It's painful I'll tell you, but the man is probably the greatest white soul singer to ever walk the planet. In my humble opinion, of course.
Here's my list then:
1. Paul. Unquestionably for me, the best all round musician in The Beatles. His vocal range far exceeds John's, and he was probably the best guitarist.
2. John. Purely based on his work within The Beatles as I don't rate his solo work apart from POB, Imagine, and a few early singles. John had a great rock n roll voice, but I think was quite limited otherwise.
3. George. George became a far better musician as time wore on, though I think, as I always have, that he only developed his slide style to counter his mediocre lead playing. Made 2 out of my 5 top solo albums. A fairly weak voice with little range.
4. Ringo. A terrifically underrated and influential drummer. Made some good solo work early on, including my favourite solo single.
Like Kevin says, it's all subjective, and looking back at an old thread I see that 6 out of my top ten Beatles songs are John's. Though I think there'd only be the one in a top ten solo list.