I’ve been noticing that LED bulbs keep getting worse and worse in build quality over time, but light quality and CRI seems to be getting better, but what is he absolute worst LED bulb you’ve seen?

It can be for anything, poor light quality, uneven lighting, short life, etc.

Some led lamps 15 years ago: cheap 5mm leds packed without heat management with absurd specs (like a 1.5W lamp rated as an 60W incandescent lamp).
They weren't even cheap

I bought two 4-packs of GE Reveal HD 2850K 5W and one 4-pack of the 8W to relamp the hallway lights.  ALL of them had failed after 8 months, and some started failing after only 2 months. None of the fixtures are enclosed or recessed either, so there's no excuse for this.
I will never buy GE bulbs again.  In fact I will never buy any premium price LED bulbs again, I just buy the cheapest bulbs I can find.  I am not wasting money on that again. Absolutely enfuriating.

 The worst I've bought was a Feit RGB bulb . IT SUCKS !!!!  It has NO memory circuit in it so you have to set the color/Light pattern everytime you turn it on using a tiny button on the side of the neck . Accidentally dropping this P.O.S. was the best thing that ever happened to it !!

I bought two 4-packs of GE Reveal HD 2850K 5W and one 4-pack of the 8W to relamp the hallway lights.  ALL of them had failed after 8 months, and some started failing after only 2 months. None of the fixtures are enclosed or recessed either, so there's no excuse for this.
I will never buy GE bulbs again.  In fact I will never buy any premium price LED bulbs again, I just buy the cheapest bulbs I can find.  I am not wasting money on that again. Absolutely enfuriating.

I’ve never had that bad luck with GE LEDs, especially the snow cone versions, the ones I had worst luck with were Great Value and EcoSmart (store brands). Never tried Sylvania. Mid range Philips seems okay (as long as it’s not the LED filament warm glow variant), though snow cone warm glows don’t seem too bad. Premium price LEDs are often better quality but are more expensive.

I just visited a house, and I’m not sure of brand but it was a bathroom light with two LEDs on the ends and an incandescent in the middle, not enclosed, all in individual glass shades, the one of the LEDs was flickering while the incandescent was going strong. They were standard snow cone LEDs I think. Absolutely infuriating! I’m guessing the next bulb to fail is the other LED.