Originally Posted by Brain Damage
The only truly "Flawless" trilogy is Toy Story.
In the close but no cigar section are Lord of the Rings, Star Wars, Back to the Future, and yes, The Dark Knight trilogy. If I had to rank them in terms of closest to being flawless, it'd go like this
1. Lord of the Rings
2. Star Wars
3. The Dark Knight
So yes, Nolan's trilogy is certainly amongst the greats, but so far nothing has managed to match what Toy Story did. Three nearly flawless films that not only make a great larger story but also stand up individually just as well.
Honestly I think Toy Story and TDK trilogy both stand at the top. Your last paragraph perfectly describes how I feel about both series.