I'm not an advanced or regular microwave user (try keeping a straight face while talking like that about microwaves lol, but I use it maybe once or twice a month averaged over the year) but frankly I don't see any performance issue with my cheap microwave compared to what one could expect from a microwave. Put food in, wait 4-5 minutes, food comes out hot.

What infuriates me are vacuum cleaners. To make them more "eco-friendly" it's even regulated in the EU now that vacuum cleaners may not use more than 900 watts. But it's not like vacuum cleaner technology has improved tenfold since I had my good old 1500 watts vacuum cleaner in the 2000s (rip). So how did they achieve this magic? Well, new vacuum cleaners don't vacuum for shit, that's how.