You're kidding - right? Ten models? Only ten? I think I've bought about 50 of them! The worst one - I can't even hazard a guess..... I've had so many that wouldn't fit together properly,and parts that had to be refined,and refitted to even make sense out of them! Some parts had to be remade from scratch,as they were so horribly mastered.
The one that I most recently built was,Airfix's 1/72nd scale P51B turtle neck. I repainted this twice fixing parts(fuselage,wings,and tail)that didn't align,and painted it with Testors' Metallizer non-buffable aluminum,only to see that the wing to fuselage joint was more than irritatingly obvious - after all my hard work!!! This is the only real flaw in it after airbrushing this to make it look as perfect as possible. I even went over the wings to make them look passable,not to mention masking off the cockpit,as I had done a pro-job on it,and not wanting to ruin it,only to see a joint that can't be easily fixed,and repainted without ruining everything I have already done to perfection! The problem started after I painted this fuselage,and wing assembly separately,but I thought that this would fit like it did before I painted it,but the joint was too wide in the front! I didn't see this until after I airbrushed it,and finished the cockpit,and installed the pilot. This is something I'll just have to live with - it's not a huge gap,but it IS noticable enough to embarass me.
The other one that I think I remember is,AMTs' 57 Chevy Bel Air. This was so horrible that it didn't even get a coat of paint! This was every modelers' worst nightmare! Everything that wouldn't fit,or look right,or even have the decency to be accurate to the original was in this Sh--kit! Think of something that could go wrong,and it did! Murphy's name was all over this one... Poor detailing,and lack of it on the fins(decals were offered instead of moulding),poor quality fit along the windshield,and tires,as well as the bumpers looked cheap(chromed flash). An all around mess! The interior looked like whoever modeled it was either high,drunk,or both!!!!
The engine,undercarriage,seats,and door panels looked as if they were originally modeled from playdough,and cardboard! Not to mention the poor fit of all these parts to each other,including a disproportioned engine with extremely poor detailing. This is truly the ultimate junkyard model car!!!! I think this one tops my list of worst car,or model kit offered by an American maker. Needless to say,I took a soldering iron,and firecrackers to it.