I understand what you are saying, but I think we are talking about different things.
I didn't say the Beatles were, necessarily, the best group ever or the most influential (although, I think they are), but that point can be argued.
What I did say, is that because the Beatles are the most popular, most well known band in the world, the Pete Best thing gets blown out of proportion. Really, think about it, more people know who Pete Best is (who is only a former Beatle) than know who the actual drummer is for many, many rock bands.
I, really, don't think the fact that the Beatles are the most well known and popular band in the world can be challenged. They've sold more than anyone else, they continue to sell more than most others (even modern bands), and most everybody knows the names of the 4 members, even if you aren't a fan.
Now, that doesn't mean that someone won't come along who will be more popular and well known, but as of right now, because of the reasons I listed, the Beatles are the biggest ever and because of this, people make a bigger deal out of Pete Best being kicked out than they should. He is just a footnote.