Yeah I have really enjoyed just about every movie in the MCU...except Iron Man 3. According to GAF, I'm just stupid though for not seeing how subtle and amazing it is though.
As great as all these movies are, they still feel like disposable entertainment. Nothing will ever top the Dark Knight in my mind because no one will top Heath Ledger's Joker in terms of creativity and impact. He took a unique spin on arguably the most famous comic villain and somehow made him even more mysterious and unnerving than Jack Nicholson's version. If the Dark Knight has a weakness, it's that I didn't give a shit about Batman by comparison because the villain was that well done. I remember watching the movie in theaters and my stomach was in a knot and I was on the edge of my seat waiting to see what the Joker would do next.
I haven't experienced anything close to that with any of the MCU movies because the villains have been mostly weak....closest thing to it was the Kingpin in Daredevil which was really well done because at times they made you feel sympathetic towards a real piece of human garbage. Or maybe the "Clairvoyent" in Agents of Shield season 1...that was pretty nuts.
So maybe the problem is that there's not enough time to build up a good villain in the MCU. The only real developed one is Loki. The Joker also has a distinct advantage of not needing to be built up because he has no backstory...so that's kind of like cheating.
TL
R - Villains in the MCU need work for these movies to be considered "great" and not "really good popcorn flicks that I'll rewatch from time to time"