Ohio. Let’s think about this.
What has opened since 1999? Off the top of my head, TPC River's Bend in Cincy and Pinnacle Golf Club in Columbus are the two private courses I can think of. TPC isn't half bad for a TPC course. I've heard good things about Pinnacle, but haven't played it yet. I guess Four Bridges in north Cincinnati wasn’t 18 holes until 2000, so I suppose it counts. Sand Ridge opened in 1998, so it doesn’t count. The merger of Sand Ridge and Mayfield did happen during this time, and was smart for both clubs.
There’s been a number of new public courses that opened. Longaberger (now The Virtues) has to be the most prominent of these. When it opened, it was in impeccable condition, charged a high greens fee, and sold out of tee-times almost a year in advance. Today, the conditions aren’t quite as good, greens fees are reduced, and tee-times are plentiful. Personally, I think the course is way overrated, but that’s just my opinion.
Other public courses of note include: Stonelick Hills, Elks Run, Indian Ridge in Cincy, The Quarry in Canton, Shale Creek, Little Mountain, Boulder Creek in Cleveland, Deer Ridge near Mansfield, Northstar near Columbus, Links of Firestone Farms near Youngstown. These are the ones I know of for sure. It’s very possible I’m missing a couple. I guess you can include Phoenix (aka Stinky Links) in Columbus, which opened and went NLE during this time.
I’ve played most on that list. Most of these courses are pretty good, but not one probably not higher than a Doak 5. My favorite is The Quarry. I think it’s 3 or 4 boring holes away from being a solid Doak 6. That, and power lines, if that sort of thing irritates you. The downside is at least half of these courses aren't realistically walkable, which will knock them down for those for which walking is an important criterion.
The Cincinnati area got a Top Golf this summer (2016), which immediately placed itself as the second best public course in the Cincinnati area. I'm half not joking.
There have been some very good renovations in this time. Large-scale renovations at Moraine and Brookside (Canton) come immediately to mind. Inverness also had a fairly large renovation, for the better. Scioto and OSU (Scarlet) also had renovations; the former generally is praised while the latter slightly more controversial. I believe Camargo, The Country Club (Pepper Pike), and Kirtland also have done minor renovations. As mentioned above, NCR South is getting some work done this off-season; and from what I’ve seen thus far, it’s going to be a better course for it. Muirfield Village continues to be nipped and tucked, though I would argue not always for the better.
There have been a number of courses close in this time. The Ross design at Acadia CC in Cleveland is the most notable one I can think of. Piqua CC was saved at the last minute. The 36 holes at Weatherwax Muni in Middletown will be a big loss for junior golf in the Cincy/Dayton area, as they hosted many high school tournaments. I’m not sure when Thunderhill opened, but it certainly closed during this time. Never got to play it. It’s 152 slope rating and copious water made it one of the hardest courses in the state. It's probably best left as a fishery.
Putting my thoughts on screen, the new construction efforts are probably a C. Upkeep on the state’s best is probably an A-. I think a B or B- is a fair grade for Ohio.