All are solid good movies but none of them are amazing. There is no Raiders or Empire Strikes Back or Godfather Part II or Fellowship of the Ring in the Bourne series. It's sad to see the Bourne franchise is about to be driven into the ground. I like Jeremey Renner but do we really need more Bourne movies? Especially without Matt Damon?
Honestly it's impossbile to have a perfect trilogy. There are plenty with at least 3 solid watchable movies. But if the criteria that all 3 are equally amazing? Never going to happen. Temple of Doom is nowhere near the level of Indy 1 or 3. Return of the Jedi started to show a lot of the issues that would plauge the prequels. The Godfather III is well The Godfather III. It can go on and on. But for those you can watch all 3 in a row and have a very good time and not have any jump the shark sort of films.
The Books>The Films 
Of course the book is better. A book is almost always better than the movie, whether we are talking about a trilogy or single film.
Hell a lot of the times novelizations of movies are better than the actual movie.