On the first place, in my point of view, is Blockbuster. No matter how you look at it, the album has everything it needs, from bad ass rap songs to melancholic ballads. Also, fans have been very receptive mostly because this album was long awaited for. Every song makes a deep impression and that's been proved. So Block B's Blockbuster is definitely the best album of 2012.
Second place goes to Big Bang's Still Alive. Besides the fact that I'm a VIP, their comeback came like a serious bang. Every song comes from their own experience and it's obvious they've grown very much since their début which was a few long years ago. Their vocals also improved and eve if TOP's dance moves are bad, like always, they know now how to make them funny and attractive. Daesung's voice is amazing and he has a lot more parts now where he shows a cool side of him. They've done something more emotional, more personal and it sounds good.
On the third place is SISTAR. I'm not such a big fan but Hyorin's voice always attracts my attention. She's also really pretty and the dance moves these girls pull off aren't that easy as they look. Their mini-album, Alone, is one of my favourites. Their voices bring something different to the songs mostly because of their different tones. But in the end they're very good entertainers and they have professionalism. That's an important factor and they are pretty famous because they do an awesome job.
The fourth place is taken by B1A4. Why? Because the latest album is so cool and sounds so different and bohemian and has some melancholy in there, some piano, a few soft female voices and overall it's a pleasure to listen to it. In the Wind wasn't on my list but after I listened to it I realized I'm stupid. It has everything it needs, it sounds classy but at the same time very new. It's definitely a good album.
The fifth place would be GaIn's Talk about S. Her mini-album captivated me simply because it breaks the barriers. There's sexuality, there's seriousness too but overall everything comes together and it sounds very good. It's not necessarily the gender I listen to a lot but her album was much better than others. I also like her style when it comes to singing. She's not a bad ass but she's not some princess either you know. She's a woman and I like that she expresses her feminism and sensuality so well without being too much.
Other good albums which haven't been included here are:
BAP's No Mercy
Yoseob's The First Collage
Exo-K (and Exo-M)'s Mama
and others that I seriously can't remember right now :)