Thats bullshit, there are many many out there, all the bad ones are due to the owners not servicing the gearbox when they service the car. You have 2 clutches working at the same time, its bound to need services, and anyone who cant see this shouldnt own one.
However the e46 m3 is in another league above the TT car wise.
3.2 330?hp vs 3.2 240hp. pure RWD vs fake 4wd (TT has haldex).