I mean, maybe I'm not watching these movies right, but I think they have gotten a lot better. Thor: the Dark World is a pretty forgettable movie, but I actually really enjoyed the others. Iron Man 3 isn't a great movie, but it's probably the movie that tried the hardest to be something else (it might have failed, but I really thought it was an interesting experiment in superhero films). Winter Soldier, Guardians, Ant-Man, Civil War (I really liked it), Dr. Strange (repetitive, but again, I thought it was fun), Guardians 2....these are the best movies and all better than most of Phase One.
If I had to rank the movies....
Iron Man (Phase One)
Captain America: Civil War (Phase Three)
Captain America: The Winter Soldier (Phase Two)
Guardians of the Galaxy (Phase Two)
Guardians of the Galaxy Vol. 2 (Phase Three)
The Avengers (Phase One)
Ant-Man (Phase Two)
Iron Man 3 (Phase Two)
Avengers: Age of Ultron (Phase Two)
Dr. Strange (Phase Three)
Thor (Phase One)
Iron Man 2 (Phase One)
Captain America: The First Avenger (Phase One)
Thor: The Dark World (Phase Two)
The Incredible Hulk (Phase One)
I still think Iron Man is the best movie all around, but it's the only one in my top 5 from Phase One. Outside of Avengers (which might be too high on my list, but it's got a lot of re-watchability) the rest of Phase One is in my bottom 6.
For me, the DCEU is:
Wonder Woman
Man of Steel
Suicide Squad/BvS (I can't decide which one I liked more...I should probably rewatch both...Wonder Woman really made me want to rewatch BvS)
But I'm not even sure how I'd fit the DC films into my Marvel rankings because I feel like it's rating apples and oranges. That's my point, though. Marvel makes really good popcorn films that I legitimately enjoy. DC hasn't really mastered their formula yet....but it took an entire phase of "meh" movies for Marvel to get theirs right.