The intention was to lose some aero and make up for it with mechanical grip (slick tires). Brawn had to spoil that with the diffuser. Now everyone is back up where the aero was.
I wouldn't say the cars were designed "unbalanced". I am sure they are quite balanced. It might be unbalanced in terms of how much aero vs mechanical grip at each end. But grip wise, I am sure they are quite balanced. Some drivers can't drive a car unless it's loose, while others like a tight car, so there is going to be some margin of balance. Also, a car that has a push can appear loose when too much steering input is given to overcome a tight condition which causes the rear to step out.
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