I, too, am a major car buff. Like my interest in RPGs, my interest in cars come from two sources. The first is my dad. He had a TR7 when I was a kid, and around the same time, he gave me a box of toy knights and handed me copies of LotR, Robin Hood, The Once and Future King, and Conan, amongst others. The latter were friends I made throughout my years. My neighbor's older brother introduced me to D&D and RPGs, and my best friend's older brother introduced me to 5.0s and the infinite myriad of bolt ons and internals that turned humble
Fox Bodies into strip monsters.
Anyways, as to car analogies. Once, before I was even licensed to drive on the streets, I was afforded, thanks to one of my dad's friends, the opportunity to drive a Lotus Elan. For those who don't know, the Elan is one of the iconic British roadsters. It exemplifies the Lotus principles of light weight, decent power, and excellent dynamics. To be honest, it was an effing dream. It's only problem, it's a British roadster with all the oil leaks, panel gaps, and electrical problems such a vehicle entails.
Fast forward about a dozen or so years, and I'm finally in the position to purchase a car that's just for me. I don't have any responsibility other than to transport myself, some groceries, and every once in a while, a lady. I wanted a car that would evoke that seminal experience tossing an Elan around the cones, but I didn't want the drawbacks that came with such a vehicle, drawbacks I was well associated with, thanks to vicariously experiencing them through my father's Triumph ownership. I didn't want oil stains on my driveway. So, I ended up buying a Mazda Miata. It's basically an Elan, but it's made by Japanese in the 21st century, which means not only is it a damn fun roadster, but it's also reliable, efficient, and not produced by a company that suffers from the perpetual threat of bankruptcy.
To bring this all back to D&D: 4E is like my Miata. It does everything I want my RPG to do, but it doesn't suffer me the cantankerous problems of oil leaks and Lucas electronics, or class imbalance or DM prep time. When my dad wanted to take the Triumph for a spin, he had to go through an entire checklist of potential problem areas that could leave him stranded beside the road. When I want to take out my Miata, I fire it up and drop the top. 4E is like my Miata; I get all the enjoyment from my favorite game, but I don't have to deal with the problems that make my hobby a hassle.