The first three Bourne's are all solid to great films. Legacy was forgettable and last year's was terrible and tarnished Damon's stellar trilogy.
Whereas with M:I, the only one I genuinely think is good was De Palma's. M:I-2 I enjoyed when I was younger but can now see the flaws; it's still a guilty pleasure, though, and I have fun when I watch it. Abrams' was okay but nothing special; felt more like an episode of Alias than a M:I movie. Ghost Protocol is trash, and I can't see anything about that movie that people like. And Rogue Nation I went into expecting to love (as McQuarrie's Jack Reacher was a favorite of mine in 2012), but again I was very disappointed by it. I don't like the more comedic and grandiose bent the franchise has taken.