Worst cubes ever?

the qiyi dino cube is bad for two reasons
1. it's basically a skewb, it just has 3 layers and it gets pretty boring pretty fast
2.it locks up super easy
 
Gan and Rubiks collaboration but in GAN 356 Air SM purple screws inside and make it super loose. I average 24 and I can only get like 2 minute time
 
I have a Mefferts triple fused interlocked 2x2 that was made with dollar store material. I didn't mind it at first but when revisiting this cube. I didn't realize how awful it really was. It literally turns worse than a jammed big cube. If you were to step on it by accident, It would likely break. It's very fragile and not worth it. The only reason It's still intact after 15 years and still in my collection was because I haven't played with it for awhile. It's still in production and costs around 17 CAD. I have other other atrocities in my cubing collection that I didn't even play with in fear of breaking them. I think it probably was a good cube when opened from the package that got worse when left alone.
 
I have this weird puzzle I got maybe 7 years ago by Meffert's called the PyraStar. It is just a modified 2x2 but my god is the turning horrible. And even worse, somewhere along the line I tried moving the stickers around but left it unfinished so I can't solve it and I'm too lazy to fix the stickers. But imo the worst puzzle overall (I don't have this one so take my opinion with a grain of salt) is the Tuttminx.
 
Tuttminx is a great-looking puzzle, but it's a pain to solve.
To my mind, there's too much focus required in making sure you don't mix up the non-interchangeable corners (a function of there being both hexagonal and pentagonal faces. A colour on a pentagon face always has to be moved to another pentagon face, for example). Corners often appear to fit in the "wrong" slot, but shouldn't!
 
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