Funny, but I'm the other way around. I know it's just me, but I don't care much for either the scherzo or finale in Bruckner's 8th. I also think the slow movement is a tad too long for its material. More and more, I've been thinking that the 8th might be Mahler's most perfect work. But, of course, that's entirely debatable. For me, the best Bruckner symphony through the first three movements is the 6th, but the finale is a dog (relatively speaking). Overall, my favorite complete, four movement Bruckner symphony is the 7th.
When it comes to 9th symphonies, I'm the other way around: I greatly prefer Bruckner 9 to Mahler 9, but only in its normal three movement form (I'm not sold on the conjectural finale business). I see absolutely no need for a finale to Bruckner's 9th.