I'm not any sort of Bruckner "expert" either. I've just enjoyed what I've heard from Tintner.
BTW: Since my original post, I've also heard Tintner's recording of Bruckner's 9th -- and I think it shares the same strengths as his 7th. Bruckner's music can sometimes seem "segmented," with abrupt transitions between musical ideas. With Tintner, I don't get that impression. OTOH, I don't sense he's "smoothing things out." It's more like he's navigating between musical ideas with aplomb, finding connections between here and there.
Also, I've got to say that I think the Royal Scottish National Orchestra sounds superb on these two recordings. Of course, they don't have the heftier, darker sonorities that people associate with "Bruckner orchestras" -- like the Staatskapelle Dresden. But the RSNO's sound -- brighter, less heavy -- seems to be a perfect fit for Tintner's interpretive approach.