It's hated because of the graphics, and the fact that the kids are toxic. Some people don't even follow the rules, like the Online Daters; they don't even get banned! Also, it's because you can't do that much stuff without robux, so that's why.
Some people hate roblox because they think its just for little kids. I find its good for all ages.
I think it's because this game is used by p*dos and alt-right recruiters, and the devs don't do anything 
I think for the online daters.
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I've seen many people hating on Roblox and that made me ask myself Why are they hating on it? Seriously it's a really fun game for kids! I really enjoy that game! Even though I don't even play it that much but it's a funny entertaining Game.