Only if it's not set up correctly, or there's an actual problem with the structure. The airfoil, moments, and areas are all comparable to a very wide variety of other trainer airplanes. With any one particular model, you will have no trouble finding people who think it's a "bad design", or is "marginal" for its purpose.

If you're trying to teach yourself to fly, then ANY R/C airplane can become "marginal".

If you have problems with your model, you may want to call the support department of its maker.