He's average at best.
On average i guess i would agree he is average, but that is a grading built up from boring pieces and a couple of flashes of brilliance. I have always felt that neglected composers do have something to offer, but you have to wade through some muck to find a few pearls.
To me, it is all a matter of percentages. With Beethoven, one could submit that almost 100% is genius, but as you start to work your way down the list of "greatest", the percentage begins to go down until you reach 0% with Schumann.
The sonata melancolique and 7th concerto of Moscheles are in my opinion works worthy of being included in regular repetoire, but this probably will not happen unless pianists are prepared to look outside of the box.
Thal