The Beatles weren't a hard rock band like the Who, Stones or Zeppelin, but that doesn't mean they couldn't produce some great hard rock. Songs like I Want You (She's So Heavy) would have sounded pretty explosive on stage. Harrison's guitar work was pretty average in 1965, but by '69 it was brilliant - the rooftop performance of One After 909 (which was an old early 60s rock & roll song) from him is a good example of how far it came.What? That a band member died in a road accident and was replaced by look alike, sound alike?
Even with advanced technology, i don't think the Beatles would be as good live as The Who and Led Zeppelin because they don't seem to have the electric explosive playing these guys have.