As of right now, I've got a few:
21 by Adele
Hot Fuss by The Killers
Homesick by A Day to Remember ♥
With Adele, I kind of find it funny that I've been listening to her album on repeat for the past month or so because I was so against her at first. I didn't care for Rolling in the Deep when it first came out and I didn't go out of my way to listen to her other songs, and I certainly didn't understand why everyone was fanning over Someone Like You. But then I heard my roommate play Chasing Pavements by her (which I realize isn't from 21) and I fell in love with her music. I went back and re-listened to everything completely dumbfounded that I didn't like it my first few listens.
Hot Fuss has a few key tracks I really enjoy, namely All These Thing That I've Done which I also had on repeat for a few months. It's a great all around album, there isn't a song on there I have a problem with.
Finally, Homesick. My brother is into some heavy metal and he played me an old song of theirs and I couldn't understand the singer so I complained and made him stop bringing it in the car to listen to when I drove him to school. He kept asking if I could play their other CD Homesick for him instead and I denied him quite a bit until one day he played it without me noticing and I really liked the song he played which was Downfall of us All. When he told me it was ADtR I was shocked but gave the rest of the album a listen and voila. They're now one of my favorite bands. Including Downfall of us All, the songs: Have Faith in Me, Homesick, and If it Means A lot to You are my other favorite tracks on the album and they will always remind me of 2011 because this album was the most played :)