Cliff,
I often feel that the Lower gets that "uninteresting greens" label because many compare those greens to the greens on the upper which have a tremendous amount of slope, but, not much in the way of contouring.
I also think that the size of the greens on the lower gives the false impression that they're relatively flat, which they're not.
As to # 7, it plays as a par 4 in tournaments, as does # 1.
I was trying to think which green was the flattest and would probably have to say # 17, but, most others still have some interesting slope.
Like many courses that host Opens and PGA's fairway widths seem to suffer, and, like Oakmont, there was a desire to move the bunkers in to match the narrowed fairways.
But, overall, it's an enjoyable and good test from the appropriate tees
Holes like # 3, 4,