My view on this....mmm.
I don't wanna keep talking about the Beatles, but here's my two bobs worth.
For me, the Beatles represent the post 50's American Rock'n'Roll, and post war Britain.
If you're looking for technically amazing instrumentalists, find another band. I feel Paul was a very very good bass player, Ringo's drumming is unique and while many think he is a rubbish drummer I'd disagree, his drumming was perfect for the band. Keith Moon, Mitch Mitchell etc would never have worked in the Beatles.
George guitar playing, similar vain to Ringo's drumming. Not the most over extravigant of guitarists but needed what needed to be done for whatever they were working on. And of course so many people can hum a George Harrison solo or licks, unlike many other guitarists, he had many of them.
John was by far the worst musician(playing instruments). But that's what I love about him. Very basic, primal no faffing around, very human, would make mistakes and would spend time doing it till he got it right. Despite that I still feel he was a very under-rated rythm guitarist, nothing amazing, but very under-rated.
Vocally I thought they were great, again they're were cock ups, but IMO I like to see that from artists, illustrating that we are all human - something I value when I listen to music.
What I'm trying to say is they were very much 4 individuals and they needed something, or someone to help them become a cohesive band.
In the old days before they were signed, this was ok, because the rawness of the straight rock covers they were performing night after night in hamburg fitted what they were about at the time. As the grew they became tighter, but then that was undown by Beatlemania.
I'm sure many have seen the footage of Shea Stadium, how out of time and basically they were playing. I still think they managed to do pretty fucking well with no monitors etc with 56,000 people screaming at the top of their lungs throughout. They had to stop recording otherwise they should have split up then.
This is when George Martin comes in the picture for me.
By this time they had already started "experimenting" with Rubber Soul and Revolver. This is when Martin became "the fifth Beatle".
Harrison also begining to have more of an influence.
Martin's use of his musical knowledge was essential to the post Beatlemania sound. As said the strings on Eleanor Rigby was his doing(though if you hear McCartney doing it on just an acoustic, sounds a bit like The Clash's London's Calling
). The solo to "In My Life", and of course the sound that they got on "Tomorrow Never Knows". Lennon stating that he wanted to sound like the Dali Lama from a mountain top. George Martin and Geoff Emerik were the ones to make this happen, coupled with Lennon's fantastic vocal. Then of course came Strawberry Fields/Penny Lane then Pepper.
Basically what I'm trying to get to is, that the Beatles as recording artists where much like other bands from 62-65, the same yet in different ways to The Stones and The Who. After Martin started introducing things like the solo on "In My Life" and they heard what it could sound like, the more confident they became. So they would then go to Martin with ideas, which he with Geoff Emerik would then make happen, which is a very difficult thing to do. It's a very much shared relationship. Rubber Soul and everything they did that followed it was based on this relationship.
I kind of always compare it to Dylan's influence on the Beatles and vice versa. Dylan has stated that the sound of the Beatles influenced his electric stuff, as his writings influenced a new dimension for the Beatles (and others) to explore.
On a side note, I'm not a massive Paul McCartney fan. He had his time and was a great songwriter when he wanted to be, and as I said a very good bass player. And I feel it was his controlling nature that split the band up, not Yoko. I feel if it wasn't for that they would have gone on, maybe not realising stuff as frequently but gone off done their own things (get those ego's stretched), and got back every now and again.
In the end all this debate is great, but if you love the music, any music, nobody is gonna change your mind on what YOU hear. If you like it, you like it, if you don't there is plenty more music out there.
P.S: Sorry for the long post, it would have been longer but I've lost bit of interest.