I have a lot of issues with this one particular recording. The scherzo starts out quite fast. But when you get to where the low strings start chugging triplet figures (three notes to a beat), he actually loses a bit of tempo. It just sounds very lame to me. Compare the first sixty seconds of MTT's scherzo to the same sixty seconds on the outstanding Chailly M3, and you'll hear a fairly big difference. Worse yet, when you get to the harmonic cadence points during both major portions of the offstage trumpet solo (posthorn) - the point in which the harmonies start turning homeward - MTT brings the music almost to a complete standstill. I don't find that interpretively interesting at all. Instead, I find it also to be quite lame, because it's an exaggeration of that which Mahler has already built into the music: each cadence point eats up quite a bit of time on its own. In direct contrast to that, Boulez just plows right through those same cadence points, and I think it sounds much better. Again, the ritard is already built into the music.
I also don't like how MTT takes the end of the sixth movement so unbelievably slow. It may or may not be correct (again, Mahler is deliberately vague on the tempi), but it just makes the music sound waaaay too marmoreal for its own good. Again, listen to how Chailly does the last sixty seconds of the entire symphony. He doesn't go nearly so slow with the business where the timpani go back and forth on the tonic and dominant notes. But he progressively lengthens the final three chords of the symphony. It's such an obvious and functional way to do that ending.
By the way, it seems that Ravel must have heard the Mahler 3rd somewhere, as the ending to his "Mother Goose" ballet has an ending very similar to that of M3; only, the dynamics are much softer on the Ravel, and he adds glockenspiel and harp glissandos. I really prefer Ravel's version of that type of ending.
MTT recorded M3 earlier with the LSO for CBS/Sony. The sound wasn't nearly as good, but that peformance was free of his strange, unproductive conducting anomolies. It also had Janet Baker in great voice - her only recording of M3, as far I can remember.
Barry