I thought the F-7 Cutlass apart from unreliable engines and hydraulics was actually quite good when it worked. I suppose that was the main problem.
Apart from that it looked cool.
That's the great thing about 1950s & 60s aviation there was so much experimentation as knowledge increased in leaps and bounds each month that within 6 months there would be a performance leap that made previous kit old. Led to some weird and wonderful shapes as I suppose the wind tunnels weren't so advanced so the only way to really check it out was to build a prototype.
Modern day planes are boring incomparison. They all are starting to look alike.
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