George Harrison wrote some great songs with the Beatles and apart from them. “Something” was the highlight for me although I love “While My Guitar Gently Weeps.” Post Beatles, “My Sweet Lord” and “Give Me Love (Give Me Peace on Earth)” were his best songs IMO.
He’s also best remembered for creating the first big concert for a cause, aka “The Concert for Bangladesh” where he brought together some of the biggest names of a generation for one fateful night. Later, aid concerts became more or less a cliche but George invented it and good for him. And he certainly wrote some good songs for the “Travelin’ Wilburys.”
But all in all, George as a songwriter does not measure up to John and Paul who of course were the greatest song-writing team of the last half of the 20th Century. They were so talented together that everyone else pales in comparison — even themselves as solo artists.
George was bitter and frustrated by John & Paul and also George Martin. The trio relegated George to one and later a couple of songs per album. But were they wrong to do that? I believe George was a minor talent compared to his Liverpool buddies and, as we all know, it was Ringo, the sleeper Beatle, who had the most popular songs post breakup.
George grew to intensely dislike Paul as you can read from his own comments and hated living under his shadow. There is that very testy exchange between the two of them in the “Let It Be” documentary.
George grew as a man but looking back, I think the Beatles handled his nascent song-writing as well as can be expected.