Ouch... not much love for the Hagens here on Amazon. Pity.
There are enough recordings, particularly of Beethoven quartets, that there is something for everybody. Yes, for many the standard Beethoven tradition lies with quartets such as the Guarneri, Vermeer, and Alban Berg, or further back with the Budapest and Busch quartets. Some friends of mine swear by the Cleveland Qt, and others are smitten with the new Artemis cycle. All have their merits, and it's not for me to tell someone what they like to hear.
What can be a bit tiresome though is sitting through the same interpretations over and over, and for some of us the chance to hear a fresh spin on the old war horses is more than welcome. Enter the Hagen Quartet. The Hagens have been recording Beethoven off and on for the past three decades now and their approach has stayed relatively the same: lean and direct, with fleet tempos and less vibrato. Think of them as a quartet version of the historically informed performance practice interpreters of Beethoven symphonies, such as Gardiner, Mackerras, Abbado, etc. Understandably, this evokes some passionate vitriol from folks that like their Beethoven on the meaty side, or from people looking for Furtwangler-esque spirituality in the late quartets. There are lots of recordings like those out there, and this is not one of them.
Also, I'm not quite sure where all these remarks about technical ineptitude are coming from. Nobody who listens to a lot of Beethoven is going to mistake Lukas Hagen for Arnold Steinhardt or Shmuel Ashkenasi, but this is far tighter ensemble playing than virtually any Beethoven recordings I have heard, and I've heard just about them all. At any rate, if you like Beethoven that is crisp, streamlined, and well-executed then this is a really fantastic recording, as are the rest of the Hagen's Beethoven and Schubert discs.