I read the first and was incredibly unimpressed. Does it get better? I love the premise, love many other sci-fi authors & series, I thought this was going to be an obviously good one.
But of course, part of the enjoyment should come from the book itself. I'd say that the book does get better as new threats to the Foundation appear, but the premise largely stays the same throughout the trilogy: will the Seldon Plan succeed?
(NOTE) The reading sequence for me went something like: 1. Caves of Steel 2. Naked Sun 3. I, Robot 4. Robots of Dawn 5. Foundation Trilogy
EDIT: remove redundant last paragraph