These cars are most definitely entry level sports cars. They are a car built for the street that can be used on the track as opposed to a car that is built for the track that can be used on the street. A much better choice for anybody that wants to get into car sports for the first time without forking over piles of cash or risk killing themselves or somebody else.
But, that does not mean that they are ONLY for entry level. A skilled driver can make even stock ones do things that the beginner can only dream of. The term "entry level" may seem like you are expected to go up to something else but really you can advance and never leave the platform. Once you have reached the full abilities of the car ( a much rarer occurrence than people here would have you think) then you have the option of upping the performance or moving on into higher 'levels of cars.
Calling it entry level is in no way an insult or slight but a simple and clear description.