I don't think that's the case. The Insignia is not a beauty and certainly not better than a 3er. It's just very nice for it's price.
The fact with Audi, BMW and MB is that they have a certain design identity and they stick to it. A 3er could only be a BMW and same goes for every other of our beloved models. But Opel doesn't have a design identity and the Insignia could easily be (for example) Peugeot. It doesn't scream Opel, and now that i thought of it, it lacks a descent interior!
