FGO is legit one of the worst gachas ever
Honestly only by numbers.
I've seen far, far worse than F/GO with many times 'better' rates. The fact that they continue to make 3* servants stronger and stronger each update to boot (Fucking targettable guts and buster boost?

roma fucking op son) and are very likely going to make them even more come grail ascension is the real reason people who say this shit honestly are blind to the wider industry.
It's the other way around, most of F/GO's wider problems aren't with the gacha proper but with how the game is managed (Server issues, almost non-existent difficulty for a greater part, servant distribution among classes and limited servants).
The gacha itself, honestly, is fairly charitable even if it doesn't seem like it.
Love your 3* and 4* servants today, kids. Don't just look for that 5* rating.
tldr; numbers are a fucking meme contents is what matters and F/GO blows a lot of games out of the water on that, i'd take 3*s that have actual use over honestly VERY small percent raises for a gacha that makes almost everything I roll that is not SSR useless.