Let me begin by saying that Inception is not bad, but it certainly isn't great. Nolan's script fails in multiple areas that harm the film significantly.

1. The characterization is mediocre. Most of the members of the team are one-note, shallow and uninteresting. This greatly hampers your emotional attachment to the film and prevents you from caring about the outcome. Compared to the intense and complex characters of The Prestige, Insomnia, and Memento, the cast of Inception appears to be mostly slick suits walking around and doing things.

2. The grandiose themes and interesting concepts that existed in The Dark Knight or Batman Begins are nowhere to be found here. Terrorism, corruption, or duty are ignored for love (which is dealt with in some of the most trite dialogue ever).

3. The plot is too twisty for it's own good, resulting in you appreciating it less as a film and more as a puzzle. Vaguity does not equal genius, contrary to many critic's beliefs.

In conclusion, Inception is a visually stunning film with aspirations at being significant, but it fails. Is it a thoughtful blockbuster? Yes. Is it the worst film Nolan has ever made? Absolutely. Should you watch it? Yes.