I don't put it on-par with Dune, but there are definitely concepts in the TBP trilogy that are simultaneously difficult and mind-opening. Some of them are quite haunting, actually.
Most of the deeper exploration of these ideas takes place in the third book.
On the other hand, I finished TBP, but I disliked it enough that I didn't go back to the other two volumes. What makes them better than the first, in your opinion? (purely for my own curiosity re: whether I should go back and read them)
The author described how he approached the series as wanting to write about the “the worst possible universe”.
I did read 5 and got about a third of the way through 6 before stopping and I still don’t know why either book exists. The previous story was over, and the new stuff’s muddled and not compelling.
To each his/her/their own.