Yeah, I agree that the material has a lot to do with it. As a road bike rider (Fuji Roubaix) and a FG rider ('80s steel Bianchi conversion), I have to say that the steel frame is much more comfortable than my aluminum/CF mix frame. The steel just offers a softer ride, plain and simple.
When I commented on why I don't like the langster, though, I didn't even consider material. I was judging it from a purely aesthetic point of view and hating on it b/c of the paint jobs and sloping TT. That Felt bike and that Giant bike are both hideous in my opinion as well. The TK3 on the other hand, is beautiful.
And whoever said that it's because "we don't like to see companies being successful" that is just pure garbage. I ride a BIANCHI...perhaps the most successful brand in bikes. Certainly more successful than Felt or Giant or even Specialized, probably, though I'm not sure about the last one. And my other bike is Fuji, another huge company. Point is, the sloping top tube and weird paint jobs are just not tasteful (IMO) and you don't haver to get into a whole laundry list of other reasons in order to explain why people don't like them...