Pretty much any and all of the MCU Iron Man related suits, including 1/4 scale maquettes, life size busts and the 1/2 scales. The Mark 42 and Iron Patriot Maquettes and their respective life size busts were the worst produced statues that I have ever seen. There have been a couple of wins, but far more misses imo. Many of their other Iron Man statues the past 6 years were barely passable, though their most recent Mark 3 Maquette wasn’t half bad at all (though most of us kept on wondering how bad it was going to be, that when it finally arrived it was better than we hoped even with the issues with the mud effect).
Also keep in mind that they were also involved in Sideshow’s Baby Groot, and while I don’t believe the drop in quality was that severe (honestly for the $215 price I wasn’t being that picky) the piece just doesn’t compare at all to the Hot Toys piece. The only downside to the Hot Toys piece was the exposed joints (which were more or less well hidden except for the wrist joints), but when wearing the Ravager outfit it was a non issue.
Also most companies use some sort of translucent resins for the movie based portraits. From Prime 1, Iron Studios to a few others. The only one who isn’t has been Sideshow. But Sideshow has finally started to use material better suited to life like portraits such as PVC (not everyone’s cup of tea though) on a few Star Wars sculpts which haven’t been half bad. The Jyn Erso has to be one of their best ever.