Why are my graphics so bad

I modded both a wii and wii u, wii u graphics look fine but i just cannot get good graphics on wii games. I have tried wii2hdmi and it just doesnt look any better.

I remember it being far, far better than the grainy graphics i see now. Ive posted here before but most solutions seem too expensive. It wouldnt be that bad but playing games like mk you cant even see where your going its that grainy. Can anyone help?