It is really good, but it’s also over hyped. It is exemplary for its genre and for its price-value proposition. It’s definitely GOTY, but really that says more about the competition than it does about BG3. It’s filled with lots of intricate little details and is clearly a product filled with passion of its creators.
Its let down a bit by the lop-sided focus of development on the early acts, and poor combat design. It’s a faithful implementation of D&D 5e and even does a good job of addressing the flaws with the system. But it’s still a shallow system that ends up with far less interesting things to engage with than their previous titles in my opinion.
Some of its best content can only be experienced solo, but requires managing the combat of 4 mechanically complex, but tactically shallow units.
If you like RPGs and in particular D&D 5e it’d recommend it. If you’re new to the genre or just curious I’d recommend other titles for your first entry.