Pros:
Quite the complete disc golf experience with every amenity you could hope for.
Exceptionally well maintained: neatly mowed fairways, fresh wood chips around all the baskets, spacious dual concrete tee pads, nice tee signs with distance and hole layout for both tee pads, practice basket, score cards w/maps and pencils with erasers. The Park Office/Activity Center where you pay is conveniently located near the parking lot between the Original and Monster courses. Inside you'll find a well stocked snack bar (burgers, fries, chicken fingers, pizza, snack foods, drinks) with clean, comfortable tables and chairs and CLEAN bathrooms (indeed a rarity on on most courses I've played). This is the most welcoming place to play disc golf I know of.
24 holes offer good shot variety. Mostly flat, but moderate changes in terrain come into play on a few holes. Nice mix of long and short holes as well as a nice balance between open fairways and wooded holes. Long and straight will set you up quite well on most holes, but a few fairways definitely favor hyzer or annie/FH drive if you hope to reach the basket for birdies. Holes are well thought out, frequently making good use of trees and bushes as obstacles. While there are a few ace runs, there's plenty to challenge just about any golfer. Holes 12 & 13 are short enough to ace, but take you around a pond to help keep you honest.
The long tees here typically require more control and a tighter line than the short tees (again holes 4, 5, and A-F being exceptions) - not always easy to do when you're trying to get additional distance on your drive. Although they don't offer a different look at the basket, saying the long tees only "add distance" is missing the point as the window you have to hit off the long pads is often pretty narrow, opening up a bit wider beyond the short pads.
Quiet, scenic park setting. This is a multi-use park, but the course is pretty isolated from other park activities.
48 holes (including The Monster) accomodates a lot of golfers, so there's hardly ever any waiting here - nice to be able to play at your own pace.
Cons:
Not a lot to knock here, but these are the facts:
Straying off the fairways can cause more grief here than other area courses. Thick, 2-3 ft high grass off the open fairways is excellent at hiding discs, even bright colors and white. Can't imagine searching for fly-died drivers in those amber waves. Trees and brush off some of the other holes can cost you a stroke or a disc as well.
Holes 4 & 5, as well as supplemental holes A-F, can get monotonous.
A couple of baskets are mounted a bit low, causing an awkward adjustment for some.
Navigation can be a bit tricky in a few spots for first timers, even with the scorecard map.
More and greater elevation changes would add some dimesion to the course (admittedly, not much they could do about that).
Never seen one on the course, but the park does warn that the only poisonus snake in Michigan lives here: the Massasauga rattlesnake, ranging from 18"-30" in length. Spends summer in drier areas, it prefers the wetlands the remaining part of the year. Just thought you should know...
Other Thoughts:
Without doubt, Hudson Mills is one of southeast Michigan's premier disc golfing experiences, and is more accommodating to DG'ers than any place I've been to. How about Disc Golf Appreciation Day (6/26/11), with events and prizes just for DG'ers?
This is a large, challenging course that penalizes you for going off the fairway (but not too severly on many holes). Even if you only play 18, there are no quick rounds here, so take your time and make a day of it. Enjoy the course and the scenery, come back to the Activity Center to grab a bite and recharge... then get ready for big brother - it's called The Monster for a reason.
Worth way more than the $2/day they charge to play here.