I find "Imagine" to be quite the overrated song as well. That being said John Lennon's music was so much more than "Imagine" and the song is 10 times better than anything Frank Turner has ever or will ever put out.
Also anyone called The Beatles the most overrated band in history probably has no idea what they're talking about and is completely unfamiliar with the majority of their discography.
False. I own the majority of their catalog and enjoy most of it but I still find them to be overrated.