In itself, I like most of the Visual Novels I read but some will confuse the Visual Novel sub-genre with Adventure games as a whole, which a lot of them knowadays have VN hybridization in their DNA.
A pure text-only VN can be immensely fun through it's means of clever story-telling while also using the visual aspects to magnify the readers impression on it.
Others can have interactive or limited interactive sections which can double as some kind puzzle pieces that needs solving to progress through it's stories.
Those are the ones I tend to usually prefer in general.
The Nonary Games (999, Virtues Last Reward, Zero Time Dilemma), Ace Attorney, AI The Sominum Files games, Ghost Trick, Hotel Rusk,etc ... are some of the best examples of these aspects put in use.