The subject of obstructed views has started to make its way into many threads, especially that of the ballparks being built in NYC and Minnesota. I figured we could discuss all aspects of obstructed views in all ballparks past, present and future. Also, which parks have the least amount of obstructed views. Not to mention there are various forms of obstucted views. From support posts of older parks to the large obstructions that block your view of a significant portion of the field (NYS centerfield restaurant doing just that). We could also discuss easy plans to fix such obstructions.
Personally, support posts never really bothered me much at the parks I have been to that had them. When it comes to Busch III, I have yet to find many obstructed views. The places that are obstructed are the right field and (especially) the left field upper deck. It's so close to the field (and in left field the front edge of the upper deck is in line with the outfield wall) that the stands block the view of your respective field. I've sat pretty much all around the ballpark and there aren't many places with vertical obstruction, meaning losing the sight of a fly ball because of the deck above you. The only places are in the lower seats and mini deck in left field. Busch II had vertical obstruction if you sat near the back of the loge level. It looks as though all cookie-cutters designed had this problem since the seats were tucked under the upper level so much.