Umm, doesn’t this thread already exist? 
Anyway, I don’t “hate” it, as it’s physically a fantastic light (great quality, great ano, great thermal path, great everything, all details dotted and crossed), but the Folomov Camp D4 has a UI I’m definitely not a fan of.
High→low, and has strobes in the main cycle, right there that’s a killer for me. When I was using it as a “Wotnahell’s making that noise in the backyard??” light, I just kept it on high and didn’t change modes at all. Didn’t want to remind myself of the ghastly UI.
Same with lights that have up/down/up/down steps.
In fact, a lot of otherwise great lights can be killed by a horrible UI.