I guess it's a matter of taste, though personally I like the mixture of silliness and seriousness. I find that most other games that I like have elements of both, though clearly, say, Dragon Age Inquisition is a little more serious but still has lots of absurd humour, and the likes of Elder Scrolls a bit more serious again. I'd hate a game to be too po-faced.
The Divinity series is certainly one of the most amusing out there, and it does seem to be a key part of Larian's writing. I rather like that and enjoy it for what it is.