I love Roblox and play a lot of it, I think there are some very fun and unique games that are overshadowed by the sheer amount of copy-paste P2W slop. Ive played so many that I can tell which ones are built off the same framework or whatever and know its not worth playing..
Theres some very old games that still have big playerbases, like work at a pizza place and natural disaster survival.
I really like one called Dream game, I see people compare it to yume nikki I dunno... I like to explore. Its a bit popular lately, or maybe I feel like it is because I see lots of posts from roblox fans talking about it.
Anything popular enough to be getting toys you see at the store is slop. As is anything with "simulator" or "tycoon" in its title, likewise with obbys but I still like obbys even if they're boring and easy.