I've heard good things about Weaver Ridge near Peoria.
I think it's fine, but probably doesn't belong on this list. A clear step down from TPC Deere Run IMO.
I'd go 7-3 or 8-2 CC of Peoria (post renovation) vs Weaver Ridge, and I think CC of Peoria falls (just) outside the top 25 as well.
If we really use the Doak scale, which says:
5. Well above the average golf course, but the middle of my scale. A good course to choose if you're in the vicinity and looking for a game, but don't spend another day away from home to see it, unless your home is in Alaska.
6. A very good course, definitely worth a game if you're in town, but not necessarily worth a special trip to see. It shouldn't disappoint you.
I would say that there really are a lot of 5's and 6's in Illinois, and it probably is hard to distinguish between them. That said, I think there are a couple 4's, or low 5's on this list that are ranked ahead of a few clear 6 and in one case higher, IMO.