The TT-02 is an entry level kit and I think it's not bad for its cost. Question is - how much can you ask for say a $100 kit. What are your goals for this kit? Are you expecting to compete in say stock class? If it's underwhelming, are you being reasonable comparing it to higher kits that are 2/3x more costly..?

I think with a good driver the tt02 is capable with even the basic of mods/right tyres/select battery on a track.