Clearly, Carlo Grante and Marc-André Hamelin (who have each recorded all of them) wouldn't agree with you! - although perhaps the only ones you might consider might be "possible to play with only 2 hands" are the 17 for left hand alone (I jest, of course!). Godowsky's transcriptions of Schubert songs are interesting too and lake a curious comparison with Liszt's in that they have a general tendency towards elaboration whereas Liszt's seem rather closer to the originals; I wouldn't be without either, frankly. As to the Godowsky Strauss waltz transcriptions - or rather Symphonic Metamorphoses (the rather grander [though by no means unjustifiably so] title that Godowsky gave them) stand head and shoulders above the many other transcriptions of these works that quite a few pianists wrote and performed (usually as encore pieces) in the late 19th and early 20th centuries; their elegance, intricacy, sensitivity, ingenious contrapuntal elaborations and consistently exquisite voice-leading make them the sheer marvels that they are, elevating Johann Strauss II's delightful confections into the pianistic stratosphere while at the same time retaining much of the character of the originals - no mean achievement in itself (indeed, they almost remind me of a kind of keyboard-wizardry equivalent to Ravel's La Valse except that the latter is an original work rather than a transcription and the none of the former conclude by exploding the entire Viennese waltz tradition and all that went with it). The three principal ones (on Kunsterleben, Die Fledermaus and Wein, Weib und Gesang) are the main works on a recent CD by Hamelin on Hyperion where they are interspersed with pieces from Triakontameron and Walzermasken, Godowsky's own (i.e. non-transcribed) two cycles of waltz character pieces; Hamelin eschews Godowsky's transcription of Schatzwalzer from Die Zigeunerbaron for left hand alone as he doesn't consider this to be on the same level of inspiration as the other three. I would strongly recommend that recording to anyone interested in this repertoire. Hyperion being Hyperion, they had the good sense not try the marketing ploy of entitling the CD Strictly Come Waltzing...