Like many that have commented on this thread, I too, have liked Bruckner for many years. I started learning to know him and his symphonies back in the 1970's, both on record (mainly through Haitink/Concertgebouw, which is still a good, evenly-played complete cycle) and in live performances by the National Symphony Orchestra of Washington, DC under Antal Dorati. Of the then-four FM stations that broadcasted classical music back at that time here in DC, most of Bruckner's symphonies were generally played late at night, after the mainstream composers and live recorded performances had been broadcast earlier in the evening. I will say that nowadays, virtually no Bruckner is played on the one classical FM station left here in DC, WETA Public Radio, and that is because its program approach has been for quite some time, and will continue to be, Classical Music 101, with a thorough immersion in Beethoven's Fifth, Ninth, and the Dvorak New World Symphony, with an occasional Mahler symphony thrown in.
Bruckner is the type of composer who requires much thought, concentration, and introspection whenever he's listened to, regardless of whether it's one of his symphonies in a version by either Haas or Nowak. He is the type of composer that does not listen well via an iPod on a subway, but at home in an easy chair with regular stereo headphones. What plagued Bruckner's acceptance by many during his life was his acknowledged lack of self-confidence of his worth as a composer. Though probably the most thoroughly-schooled composer in composition ever, I would put forth the supposition that in addition to the self-confidence factor, his thorough musical education worked against him in helping him achieve his own unique voice as a composer until late in his career, whereas it happens early for most composers. Conductors such as Richter, Furtwängler, Knappertsbusch (I'm surprised no one's mentioned him) Jochum, and Böhm contributed much to bringing Bruckner before the public considerably earlier than did many other conductors for Mahler. The anti-semitic factor also worked against Mahler, whereas Bruckner didn't have that to worry about.
Bruckner as a composer, already had his mindset established before he ever put down a note on paper, and it never changed until his dying day. He is probably the one major composer to go through life without ever having had a crisis to change his outlook on composition. Mahler's mindset as a composer was constantly subjected to upheaval and change, and as we all know, it showed in whatever he put to paper.
Wade