i have to agree with ya here. I have noticed that GM has gotten bad with the interior thing. After the camaro came out, alot of people thought the interior was pretty cool looking, how the gauges were and such, hence why like 3 of there models share close to the same setup. Now that the Cruze got amazing remarks on its interior, ill bet you start seeing alot of there other cars get something similar.
Exterior wise, yea alot of companies are putting close to the same grill/front end style on alot of their vehicles, but some just do it better than others so at least each car is easily recognizable by model.
On another note, i do get what the OP is talking about. Take for instance the scion TC. I just saw what im guessing is the new body style, and it is deffinately more on the boxy side as compared to the first gen.