It totally depends whether you're still experimenting and learning or not, which is totally circumstantial. Sometimes I slog through things at the start, on the promise that they will start to be fun once I see the point.

Easiness is fun because it enables more messing around and learning. Not having to solve a problem is not fun, because problems are learning opportunities and are fun, unless they're just trivial obstructions in the way of the real problems of interest.