First off, I have to say that the Lambda forums are the only ones like them, all others use the same templete, and are not as user friendly as these. Kudos to Admin for creating these unique layout forums. (at least from what I've found, they are unique).
As for the vehicles, this is what makes them so special:
Brand new platform
Technology firsts, and a vehicle platform that created a completely new category in vehicles, which others are now following.
Brand new assembly plant that was made specifically for producing them. (not to say, it can't be retooled in later years, but it (Delta Plant) was built to produce the first Lambdas, and eventhough Traverses were built in TN first, I think the Delta plant is more specfic to producing the Lambda platform....some will argue this, the TN plant is still state of the art...no offense for those who own TN built Traverses.
I would also say that Lambda vehicles are very similar, in the mechanical sense, but then they also are so different in many other ways, and it's that fact that makes these vehicles so cool. They are not rebadged vehicles, like other examples, but rather a great example of platform sharing done right. Also, because of the high technology factor, there are some....let's call them quirks, that make them interesting to own, and once you know these quirks (thanks for the forums) you can appreciate the vehicles, and understand them better.
But I'd have to really say the most special thing about the Lambda platform is it's pationate owners, who understand their uniqueness and are proud to own a brand new platform vehicle, that started a trend for unibody big crossovers that take us into the next several decades, getting away from mini-vans and large body on frame SUV's. It's all part of the change in buying habbits, brought on by the current economy, and environmental concerns. That's about all I can come up with.....anyone else have more to add?