What makes a good book?

Is it plot line, or prose? Is it funny or smart anecdotes along the way?

It is, and it isn’t, all of these things, plus a bit more. You need a good plot, and you need to have a decent prose. At the least, you should be able to write good enough to know the basic rules. Adverbs are hell, personification is to be used lightly; dialogue tags should be simple – and all that other jazz you hear people discuss.