Having driven a variety of Audi and Volkswagen diesel vehicles and watched the R10s running on the race track I can affirm that, unlike in the bad old days of diesel, acceleration is generally no longer an issue with diesels.
Where the TT TDI shines is mid-range acceleration. Underway a quick stab of the accelerator sends the TT surging forward. Combined with the excellent grip and stability of the Quattro drive, the TDI torque makes accelerating away from corners a breeze.
Source: Autoblog Green