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CroBob , I've emphasized what I think the problem is:
Humans Are Not Rational. Due to our brains wiring, to our emotions, to the limits of our perceptions, we are very very flawed. Most of our decisions are ruled by irrational and subconscious forces. We only
think we're making our own rational choices, because well, they're our choices and we're rational, so they must be rational choices...
There's a study that I think will help here. Two groups of people were given a scenario: "You are going to a play you want to see. Tickets for the play are $20." One group were told "You have purchased a ticket in advance. When you arrive at the theatre, you find the ticket is missing, but you have $40 in your pocket." The other group were told, "You brought cash to buy a ticket. When you get to the theatre, you find that one of your $20 bills are missing, but you have $40 in your pocket." Both groups were asked "Do you buy a new ticket to see the play?"
Most of the group who lost the $20 bill said yes. Most of the group who lost the ticket said no. The ticket group said "I don't want to buy something twice". But the $20 group lost the amount of the ticket, too! Both slips of paper intended for the play are
worth the same amount; both groups lost $20.
The point here is that despite the superficial nature of it, purchasing the ticket
meant something different than a slip of paper worth $20 they intended to use for the play.
In this situation, one group is putting more importance on the meaning of the word Fighter, and what that Means to them, built up over playing fighters or seeing them at their table for years. In their mind, "The Fighter is the master of weapons and is about killing enemies with weapons". So when 4e says "The fighter is a Defender, and good with melee weapons, it violates the impression they have built. And once an impression is made, our brains are
very stubborn about giving them up. So here you have a Meaning that's important, and a Meaning resistant to change.
There are other factors here, of course - experience, taste, etc. But a lot of it is purely a psychological hiccup. Bare in mind
I am not calling people who dislike the 4e Fighter for reasons listed above as irrational, necessarily. Merely that I'm explaining why something that is seemingly superficial actually matters to some people.
Every-day irrational behavior is one of my new favorite subjects in Psychology. I wish I'd done my Masters thesis on it. If you want to know more, there are about a dozen books I could recommend on the topic.