TLDR: there are some good games out there, roblox promotes trashy ones. the platform itself is kind of janky. Community isn't so great.
(Click here to see longer, more indepth review) So, let's see the long review, shall we? Roblox itself is quite an interesting platform to play games. Frankly, it depends where you look what experience you get, because there are a lot of games. Most bad, some good. For getting unique and fun games, I'd reccomend going to youtube or some search engine and searching for the best roblox games to play. Roblox truly has something for everyone. It just depends where you look.