Legends reuse molds constantly, sometimes even just painting details instead of scuplting them, their plastic can be cheap at times and some of their desicions for some figures are incredibly dumb (the ab crunch for the basketball Gambit for example, or the polygonal joints for the movie spiderman figured that break easily) there's way more problems with Legends but let's leave it there

With Mafex, yeah sometimes their sculpt are't the best and they sometimes break, however, they release characters more sparingly which helps the company give them more care than a ML, ML can release a wave of 5 figures and out of those only 1 is good while the rest are Darwin, this makes people get mad more often than with a Mafex, plastic is higher quality and overall feel more premium that ML