Sorry, but I always find these kind of questions quite funny
"Good" is such a subjective way of seeing things.
And to explain if a game is "good" always calls for some more words than just, "yes", or "no".
Well, we Old Players who´ve been playing since release or Beta almost six years ago, will probably say it´s "good", or even "great".
Many newer Players, who are inclined to compare it to all of the new Games out there will probably state "good" out of a wish not to be rude, or just say it´s crap.
Because it hasn´t got some features the new games have.
Others will like it despite that, or just because of that.
But what it´s got is many other nice things that can be much fun and provide extremely good gameplay and opportunity to learn things can be different from the mold of mainstream games out there and still be fun to do.
Take a look at this thread and decide for yourself.
Its a big old wall of text and I´d like to advise you to read all of the "bigger" posts in there, because they provide a good overview of things that make Ryzom unique and playable, or not. It´s a bit outdated, so the point about "Invasions" doesn´t apply right at the moment, but most of it still holds value and will hopefully answer your questions
And if this can´t convince you or is too much, just give it a try and decide for yourself.
Some like it, some don´t.
That´s the way it is.
CU
Acridiel