When I start reading LotR, I find it hard to put down until the end. Outside of some segments (I admit to skimming Bombadil... I love the idea of Bombadil, I don't like the execution much), it flows smoothly. People might facetiously throw around "Descriptions of every leaf and twig", but I never found his descriptions to take away from the flow.
The songs on the other hand...
I've never read Maze Runner, but I honestly really enjoy all the movies. They're pretty damn awesome with solid acting throughout.