I think most people who are critical of IKEA would be fine with cheap carboard furniture, if it weren't for their unethical practices hinging on corruption in developing countries. I recently learned of their practices of clearing old growth forests and was quite ashamed for falling for their greenwashing campaign. I won't be buying their products anytime soon.
Some recent documentaries about this:
https://www.youtube.com/watch?v=gSV7RlgQtWc
https://www.youtube.com/watch?v=860f0EqmYao