Should I stay or should I go?

So.  I'm four chapters into Alan Snow's Here Be Monsters!, and so far, it's a bit of a slog. 

It's a really attractive book -- I do love the illustrations, though I find them distracting.  Neither the story nor the prose is doing anything for me.

I'm thinking it might be too silly for me, what with the Wild Cheese Hunt and all.

Who out there has read it?  Is it worth it?  Should I keep going?