Granted, the Glock is practically indestructible, and will probably out-last you. However, the Glock design is over 20 years old, and needs work. The trigger pull, which is an essential element of handgun accuracy, feels like you are raking gravel. The reach to the trigger is too long for medium or small hands. The fairly sharp trigger safety can do serious damage to a trigger finger in less than a box of shells. Glock has stubbornly refused to come out with a flat backstrap for smaller hands, even though this has been available on the Colt 1911 for longer than I can remember.
A shooter's skills should be dedicated to putting the bullet hole in the right place. A good handgun should not "bleed off" part of those skills to compensate for design flaws or outdated technology.
I've owned three Glock 23's (previously the Gen 1 and Gen 2, and currently the Gen 3), and have a medium-size hand. I solved the trigger pull and reach problems by installing a Glockworx fulcrum trigger. Expensive, but worth it. The trigger safety is better, but still can hurt if the gun is shot too much in one session. TruGlo tritium night sights were another worthwhile addition. These two changes made my Gen 3 Glock 23 a worthwhile and accurate carry gun. If they hadn't, I'd have ditched the Glock entirely in favor of another good revolver.