But why do we insist that this is a bad thing?
True, while no person out there is a culled piece of perfection molded into the body of an adonis (except for Captain America, of course). However, doesn't a soldier not train to be all that they can be? Or doesn't a musician practice endlessly to make sure that they're the greatest crumhorn player out there? Obviously you want to make sure that you develop your skills in such a way that they emphasis not only your natural ability, but also the goal that you are driving towards. It just so happens that in Dungeons & Dragons - along with most of roll-playing games - that the goal is to vanquish evil and rid the world of <insert name of your campaigns BBEG here>.
You might be saying out loud in a frumious tone, "But sir, those people are taking their natural abilities and enhancing them with training. The douche-bag next to me is creating the optimal specimen for a specific scenario by giving his half-orc fighter a 22 Strength while completely neglecting his Charisma and Wisdom." That is true. However, the player isn't going to create a fighter with an eight strength, nor is he going to make a bard with a 20 constitution - You're going to put the points where they matter. And if you really think about it, a person who is mentally weak is not going to be able to spend the time in libraries with their nose in a book to become a wizard, nor is a person who is constantly tripping over their shoelaces and fumbling with their chopsticks going to decide to become a thief. So therefore, if you end up reverse engineering the character to say "Well, they seem to be naturally dexterous, so obviously the rogue makes perfect sense for them" then suddenly everything seems okay. It's often times the fact that the class comes before the character that we become inflamed.
Now, do I think it's right that every character except for sorcerers and bards has a crappy Charisma score? No. Do I think that the fighter necessarily needs a natural 20 Strength? No. Everyone out there has the capability to create a maximized character without necessarily delving too far into the minimize portion that we ultimately all dislike. It isn't really when the wizard puts all of his points into Intelligence that we get upset, but rather that he takes an 8 on all of his physical abilities that truly gnaws at us. Your caster could have spent some of his time running laps around the non-fiction section to keep himself awake during a long study session, just as easily as your fighter could have developed some pick-up lines when trying to flirt with the barmaid.
You can have the best of both worlds in the end - A character that has all of his key stats where they need to be, while also having a little extra something for flair that separates him from the rest of the bland cookie-cutter builds out there. In the end, just try to be a little more creative at the table, and you'll dodge the flame of the grognards.