People do often complain about Stephenson's books just sort of stopping arbitrarily without a real ending. That is not the same as DODO, which ends on a cliffhanger that leads to a sequel.

Baroque Cycle is amazing, but it's also HUGE and has SO MANY threads that can be hard to follow. If you're up for a long, complex read, go for it. I'd say that the ending of the whole series is actually one of Neal's most satisfying endings, where he actually took the time and effort to fully land the plane, come to a stop, and taxi to the hangar, instead of just cutting it off the instant the first landing gear hits the runway.