Burnout 3 and Sly Cooper 3 are the only two.
Burnout 3 doesn't count because that's not the conclusion to a trilogy though.
But for the most part the trilogy rule holds.
Jak 3, not as good as Jak 2 (Or Jak and Daxter)
Ratchet and Clank 3, Sucked shit
Prince of Persia: Two Thrones, was the worst of those. (to me anyway)
The Godfather 3, why god why?
Return of the Jedi, you've got to be kidding me
Return of the King, I don't care what you say Two Towers was better
Now that I think about Toy Story 3 was the best Toy Story movie.
Burnout 3 doesn't count because that's not the conclusion to a trilogy though.
But for the most part the trilogy rule holds.
Jak 3, not as good as Jak 2 (Or Jak and Daxter)
Ratchet and Clank 3, Sucked shit
Prince of Persia: Two Thrones, was the worst of those. (to me anyway)
The Godfather 3, why god why?
Return of the Jedi, you've got to be kidding me
Return of the King, I don't care what you say Two Towers was better
Now that I think about Toy Story 3 was the best Toy Story movie.