Just came back from Rogue Nation and I've been reading you guys on the last few pages and I agree with most of you: this is a solid, solid entry in the franchise but I must say I love Ghost Protocol so much that it didn't top it for me. BUT it has a better story, much more interesting. GP is fantastic in the team dynamics, the set pieces, the music, how inventive it is, but on the other hand RN also has a lot of truly spy-like moments with double agents and suspense and all of that that reminded me of the first one in many ways (specially in the foggy, night sequences in Vienna and London).
So yeah, between III, GP and RN, you pretty much have everything you'd want from a Mission Impossible movie. Each and every one of them have something special and are valuable on their own.
This truly has become one of my favorite franchises. And Tom Cruise, man... he is a movie star, no question about it.