So the A4 (or PQ34 as VW Group call it now) platform was "dull and wretched", but the A5 (or PQ35) platform is "a country mile better". In terms of dynamics, the main difference between the two was the rear suspension - torsion beam on the former, multi-link on the latter. Interestingly, the New New Beetle only gets the PQ35 rear suspension on the 2.0 TSI model. What do the lesser variants have? You guessed it, torsion beam!
As for the "daft rear spoiler", I don't think that back end is going to generate much downforce by itself, so I think I'd rather have one, thanks. Anybody remember the hasty recall of the original, spoiler-less Audi TT?