TT-02 is a good car for a hobby store to use to get new people on the track. The low price and lack of adjustability makes it easy to get into racing. Newcomers are not overwhelmed by the endless adjustments most other cars have. This gives rookies a much better chance to win with little practice. It's one of a few classes of racing won on the track and not the workbench.
This is a low cost entry level car, made more for bashing, so your going to get slop. A lot of people that buy RC cars use them 5 or 6 times and that's it. Plastic bushings fine for that. Get the bearings if your one of the few that races it in a TT-02 class or want more use out of it. This car will need some money if you want to race it against X-ray, Shumacher, or Associated cars, and you will be at a disadvantage. Those cars are made for racing.