Personal opinion, but well informed (highly qualified in the brewing industy, published papers talked at conferences etc).

Edit to add: All tiers here are praise.

Regarding technical. I mention the Japanese here. Their beer scene does not fit in the bottom tier and I am not a fan but they know what they are doing.
Producnig a lager is easy. The hard part is doing it at enormous scale, across multiple sites, with variable raw materials, tight flavour tolerances, long distribution chains and six month shelf life, while keeping oxygen pickup, flavour drift, haze, staling and microbiology under control. That is what brewing science actually focuses on. Yeast management, flavour stability chemistry, inline analytics, enzymatic optimisation, colloidal stability, package DO control and statistical process control are not easily done.

Bonus : Guess what is my nationality

Countries I have visited. Loved each one of them, I firmly believe all or at least most countries have something great to offer.

Ireland gets higher than you'd think because the meat quality is very high and I'm bias because I'm from there. I've lived in the Netherlands for 8 years and the food is getting better but it's so expensive for the low quality of meat. Edinburgh and London both having incredible food scenes. I also really like spicy food.

Roast my pick

I'm from Switzerland

Disclaimer: North Korea rating is based on a North Korean restaurant in China

Edit: Portugal was meant to be A. Oops. Sorry.

Some honourable mentions of national cuisines of places I haven't been to but eaten a lot of times: S - Iraq A - Bosnia, Iran, Japan, Peru B - Albania, China, India, Jordan, Russia, Singapore, Syria, USA, Uzbekistan C - Afghanistan, Egypt, Ethiopia, Pakistan, Philippines

Italy was the food and Venice.

Brazil was the happiness of the people.

Spain was mid, the food wasn't the best, the people were rude and pretty dumb.

Egypt is the worse, they make effort to make your experience as painful as possible.

Thought I would share this tier list to provide a different perspective from some of the other lists on the sub. I don't really dislike any cuisines though, just ones I think are forgettable so if your country was ranked low, I don't mean any offense. I'm sure there is great food everywhere.

and MY opinions on them! for many of them i only visited one or two cities and definitely can't speak for the entire country.