This is coming from a HUGE Christopher Nolan fan who watched it at one of the few 70mm IMAX theatres (The way Chris Nolan intended).
1. The sound quality is typical Nolan (Horrible). Lots of background music throughout the dialogue scenes where the bass drowns out the actors. I'll never see another Christopher Nolan film in a theater again. I'll wait a year or two before he digitally fixes the issues (a la Tenet & Baine's voice in Dark Knight Rises).
2. The movie seemed like it was pieced together quickly. No characters were truly developed (especially the love interests). Therefore, I didn't have any vested emotion as to anything that happened to them.
3. No timeline. Could barely follow which place an time each scene was in.
4. Cilian Murphy is the best part of this film. And the reason it gets one star instead of zero.
I walked out at the 2.5 hour mark, because I simply didn't care anymore.