Wasn't the lighting improved recently? If not, that's a really, really easy thing to fix in a building like this.
Seating can also be changed out, as we've seen before. I went to a couple of games two years ago and sat about 4-5 rows up from the floor, and I don't recall feeling any more cramped than I do at most stadiums, and I'm a pretty portly guy. (You want skinny seats? Upper deck in the The Ballpark in Arlington/Globe Life Park. They're 2-3 inches skinnier than lower deck.)
As for how the Super Pit looks on the outside, the recent change from the old brown wood up around the top part to the silver shiny stuff looks better, IMO, but it could still be better. I always liked the SP because it kind of reminded me of old Reunion Arena in Dallas. Both were flat on top, with a large square or rectangular "lid" that extends out over the side. Too bad they didn't copy RA more and use a dark glassy finish around the top and then add some green (or multicolor) LED lighting around the periphery of the top to light up on game days.
Some other easy improvements. They need better exterior lighting for walking across NT Blvd to the parking lots. Last game I went to I noticed the large mast lights were mostly out. They should cut back the trees around the SP so they don't look so old and block the view. They could also reroute or submerge the power/phone lines along Ave. D just east of the SP. Those old wooden telephone poles and sagging lines don't exactly scream "modern" to anyone.
Oh, and lastly, paint the damn top of the roof. Put a bit green "UNT" or SoW on it so when people are looking at Denton in Google Maps or Google Earth, they see it!