I would say today's frozen food is better than the old frozen "TV dinners" we had back then. I always thought the microwave enabled the quality in today's frozen foods? IDK.
I just recently got an Anova Precision Oven (which has steam injection in addition to otherwise just being a really good and consistent convection oven) and literally everything I reheat now just tastes fantastic.
But IME even with a good microwave a lot of frozen meals tend to reheat somewhat unevenly with the default directions even with a rotating tray. I do admit I've never used a microwave where the magnetron moves though.