It's difficult to give a concrete rating to a game that has been around and changing with the internet for more than two decades.

On one hand it created and for a while dominated the niche subgenre of the browser pet sim, but as the years went by many others surfaced that either did things different enough to grab players attention away from it, as well as adding quality of life improvements to keep them playing.
I haven't checked it out in a while so I'm not sure of it's current state, and I can't say that it's an experience that I'd recommend to people who have never tried a game like this before.

Is one of those experiences that unfortunately is not the same as it once was and relies a lot on it's community to be enjoyable.

But if you love collecting 20+ years worth of items, trophies, collectables and so on who am I to stop you?

However if you're interested on the history of the site (which is fascinating to me) I highly recommend checking out any documentary essay on youtube that you can find on it, the stuff that this game has brought up to the table and all it's controversies are incredible.