Evan,
Dunno what "Bos Landen" you played to think it is worthy of mention, but apparently it wasn't the same one that Brad Swanson and I played a couple years ago and roundly despised. Probably would rate about a "2" on the Doak scale. Poor routing, cart paths in all the wrong places, etc.
I'll agree with the rest of you what you said. TPC Deere Run is in IL BTW, not IA, so regardless of anyone's feelings about it Iowa can't take credit or blame
Amana is a fun course, so long as you can hit it up in the air pretty well, because a lot of the time you are hitting off elevated tees to fairways in a valley and back up on high to the green. Its nothing spectacular, but when the greens are firm and fast like when I played there a few weeks ago they are murder. Had to be running at least 10.5, faster than I'd ever seen them before. Sure adds some challenge there. Like you say, a lot of the fairways are fairly narrow but funnel misses back into play -- but if you are wide of the funnel you are reloading, I've never got around that place without losing at least one ball.
The U of Iowa course, Finkbine, is my home course so I'm not sure I can comment on it objectively. Its been regrassed with A4 bent on the greens and A1 on the fairways and tees last fall, and its still growing in but playing very well. There's been a lot of rework over the past 10 years to correct the Robert Bruce Harris syndrome of putting bunkers well back from the greens to allow for the gang mowers. The course suffers from a few (hundred) too many trees, every season a few more places where it is possible to miss the fairway get planted so its easy to stymie yourself but its not quite an impenetrable forest yet so there is often room for the heroic shot, if you are willing to accept the risk of Ben Wright's "dreaded other" should you fail. Its good test for most players, though pros would eat it up since they can keep it between the trees and the greens are large and generally hold reasonably well due to the extremely sharp back to front slope on most greens.
One "hidden gem" you might want to check out if you are in the area, Evan, is Saddleback Ridge in Solon. Its got quirk (6 par 3s and 6 par 5s, including a stretch of 6 in a row that aren't par 4 on the back nine) and a few fairly wild greens -- the 13th green is something to behold, three tiers, some sloping back to front, some side to side, some front to back, a generous false front, and well elevated up a hill at the end of a 565 yard par 5 that plays into the prevailing wind. Its the only green I've four putted in as long as I can remember, and that includes trips to Scotland and Ireland. The front is interesting but nothing too special, but the back nine is pretty cool, has a definite linksy feel with all the fescue and firm turf, especially when the wind is really blowing, which it usually is out there. I keep intending to take some pictures of the place and post them to see what other RSGs think of it.