My love for this franchise started with Mission: Impossible - Fallout. To this day, it remains one of my most precious moviegoing experiences (watched it in IMAX 3D). I've since watched and rewatched all of the entries several times. I even like to revisit the trailers for the last couple of movies, because I've realized what draws me to this series. Along with the score and its variations, and top-notch filmmaking, it's its central theme of overcoming the impossible, whatever it takes. It's such a crazy and inspiring notion at its core. This is why I love the M:I series, and I figured what better way to express that than in this forum?
Also, my ranking:
1 - Fallout
2 - Dead Reckoning
3 - Rogue Nation
4 - The Final Reckoning
5 - Mission: Impossible
6 - Ghost Protocol
7 - III
8 - II