You're just a sucker for punishment aren't you? I already pwned you on the CTS v. various BMWs earlier..... hell, why not this too.
The Lambdas seat seven.... which meant the appropriate comparison to a Trailblazer is the Trailblazer EXT.
First, I doubt anyone could successfully argue that the Trailblazer is more user/family friendly than any of the Lambdas. The rear seats in the Lambda are usable by adults while the rear seats in the Trailblazer EXT are only good for people age 10 and under.
Now about the weight issue. The Lambas weigh in at 4925 in AWD form. The Trailblazer EXT 4WD weighs in at 4954. There goes your weight arguement.
On the engines... Horsepower on the Trailblazer EXT 6 cylinder is 291... yes, higher than the 275 on the Lambdas. However, the Lambda engine hits it's torque peak of 251 ft/lbs at 3200 rpm rather than 4800 rpm for the torque peak in the Atlas I6. Transmissions being the same, that means better around town scoot..... but the transmissions aren't the same. The Lambda has two more gears than the GMT360... which means better acceleration and better fuel economy.
But wait, there's more. Read just about any review of the Trailblazer EXT with an I6 and the reviewer will call it a slug and either recommend opting for the V8 or just moving up to the Tahoe. Most reviews of the Lambdas tell readers that they can opt out of the Tahoe now and get a Lambda instead. Considering the GMT-900 Tahoe is one of the best full size SUVs on the market, that is pretty high praise.
As for "plastic cladding" on the lambdas, I see none. I invite you to post a picture of a lambda, your choice, and circle in red the areas that have cladding.
Now.... are you done or do I have to call Dr. House to find out where in your colon this drivel is coming from?