The thing is whether you like a book or not can be very subjective. All best selling and / or critically acclaimed books will have at least a few reviews saying what absolute trash it is.
But yes it is very hard to get an agent and hard to get published. The stats testify to that but also just go along to any writing group or speak to a bunch of creative writing graduates and see how many of them are struggling to get published despite putting a lot of time, effort and resources into pursuing their dream.