I think its unfair to call m3/r4 shitty, as they are good beginner carts... no real optimisation options are available but they are decent carts... dont get me wrong the sc1 pisses all over them but they are good budget carts... one day they will have similar functions to the sc1 they just cant reverse engineer quick enough to keep up with us!! But for people that struggle with understanding the flexibility and options available to the sc1 its a good start... personally I prefer N-card clones to the r4 but its a stretch to call them shitty!!!!!!!
This IS just an opinion and everyone is entitled to them no matter how wrong they are, popularity does not indicate performance!!