The number of new releases bought per years has gone down further and now lies somewhere between five to ten. The two new discoveries which made the biggest impression on me in this decade thus far were Mortillery and Avatarium, well thinking about it, they were also the only new discoveries to make an impression on me at all. While the music they play isn't something new (old school Thrash Metal resp. Doom Metal mixed with 70ies influences), there's something special about these bands (for me) I can't exactly pinpoint. Their female vocalists definitely play an important role (though I'd prefer Cara McCutchen's vocals more, if she sounded less extreme on some of the songs) and so does the guitar work, in the case of Avatarium especially the guitar solos by Marcus Jidell.
In addition to the aforementioned new discoveries, Voivod made a strong comeback with "Target Earth" in 2013 (for me their best release since "Nothingface" in 1989, which I didn't expect at all), Mekong Delta's "Wanderer on the Edge of Time" (2010) is also their best release since the eighties and the five songs on Watchtower's recently released EP "Concepts of Math: Book One" are at least as good as the songs on their last full-length album "Control and Resistance", which was released already 27 years ago. I also enjoy Madder Mortem's current release "Red in Tooth and Claw" a lot. A very positive surprise for me was Nightwish's "Imaginaerum" which unexpectedly re-sparked my interest in them, though I have to say that their latest album unfortunately managed to somewhat cool it down again.
There are only a few other Metal releases from this decade I bought and also enjoyed, namely "Onyx" by Ava Inferi, "The Metamorphosis Melody" by Midnattsol (I still like "Nordlys" better), Mekong Delta's "In A Mirror Darkly" (definitely not as strong as "Wanderer...", though) and Voivod's "Post Society". I'm still a bit undecided about Savn's eponymous debut. There are some songs or at least parts of them I find quite enjoyable, but apart from the fact that I don't like growling, I definitely like the heavier/more complex style of Midnattsol better. And I'd probably still be listening to Forbidden's "Omega Wave", if the entire album was as strong as the first and the last song on it.
While I'm not sure, if I should mention the second albums by Stolen Babies, "Naught" (2012), and Bergtatt, "Lagnadsoger" (2013), among Metal releases (though they are at least metal-related, the latter perhaps more than the former), I can definitely say that they both are among my favourite relases of this decade.
As regards non-Metal releases, the album from the current decade which has made the biggest impression on me is definitely "Sunrise" (2013) by Ketil Bjørnstad (not only because it also features my favourite singer/lyricist Kari Bremnes - though only on four songs as soloist), followed by "Og så kom resten av livet" by Kari Bremnes. Other enjoyable releases are: "VII" by Qntal, "Strid" by the Oslo Kammerkor, Garmarna's "6", Dead Can Dance's "Anastasis", "A Curious Thing - Live Orchestral Versions" by Amy McDonald, "Gilvve gollat" by Mari Boine feat. Norwegian Radio Orchestra and Estampie's "Secrets of the North".
Judging by quality and not by quantity, it's still a very good decade for me.