His Debussy is excellent - lines are seamless and effortless. He got a grammaphone for the Images++ disc.
I wouldn't say his Rachmaninoff concerti are emotionless. Objective perhaps. What stands out most about the the set is the underlying excitement. In fact, it sounds like he studied Rach's own recordings diligently. I never really liked the 1st concerto much before I heard Kocsis' - the 1st movement is finally played as fast as Rach and sparkles! Great cadenza. Wonderfully warm 2nd movement as well.
Rach etudes/preludes/sonata - stays in my changer.
Never particulary liked his Classical though...too romantic sometimes.
His technique can be beaten by very few of his generation. The guy has fast fingers - a true super-virtuoso.
As far as popularity - he appears to be content to tour Europe's recital halls, play 50 concerts a year, compose, and promote Hungarian music. Not too shabby.