Pros:
Tuthill provides quality holes for beginners and pros and is fantastically well kept up. The tees are enormous and easy to find, there are trash and recycle bins everywhere, and nearly every tee has a bench or picnic table beside it. There are even crosswalks to help you across the road to holes 16 and 18. The two parking lots make it possible to start in multiple different spots or skip a few holes, and if you walk in (possibly from another DG park nearby), you can start on hole 15. Even after some rain, the course was in very good shape.
This course has a great variety of open and wooded shots. Holes 3-8 and 16-18 are the more technical ones and manage to have a good variety of right-to-left and left-to-right holes. Most can be attacked with multiple kinds of shots, where one line may be the more aggressive one. The open holes are usually pretty good, with some decent and varied distance, and a river to watch out for on a few holes. Hole 16 is a rare case of a super uphill shot with a low ceiling.
Most holes have two pin placements, and in most cases, they do a good job giving some extra variety without fundamentally changing the hole. Most players will probably be taking the same kind of tee shot regardless, but the angle may need to be slightly different.
I have to talk about hole 6. It plays down a literal sledding hill and slowly turns to the right toward the long pin. There are all kinds of shots available and all kinds of mistakes that can be made. It's pretty easy as far as par 5's go, but it is surprisingly easy to turn the disc over because you're throwing downhill, or overcorrect and have it hyzer out early. Both sides of the fairway are upslopes into the woods, so it punishes bad drives while still making it fairly easy to find your disc.
Cons:
Several holes are rather boring. Hole 1 is an underwhelming start to the course, and 2, 9, and 10 aren't much better. Most of the par 4's are on the easy side (3 and 11 come to mind) and should really be par 3's for professionals. Even hole 18, the tightest hole on the course, has an easy RHFH line, though a bad kick will instantly end your disc's career. Hole 9 has only one tree in the fairway, 11-14 are pretty open, and 2 and 5 aren't too bad, although those two both have some trouble to get into.
Even a few of the more wooded holes aren't that hard. While 7 and 8 are fun to play, they're both pretty short and rather easy if you know the right line. Hole 7 might be difficult to birdie with a RHBH unless you take a hyzer around the outside, which is not an ideal design.
While navigation is mostly good, the tee signs are rather lousy. They only show the distances to the pins, and without a tee sign on the map, there's no way to tell which pin is active. They also don't list par. There's also a long walk down a running trail to get to hole 17, which is the only spot on the course where having a cart may be difficult. On that note, there are some other trails in the area that could get in the way of the course. The tees are also slippery when wet.
Hole 6 has a short pin that needs to be taken out. It's still a decent hole but pales in comparison to the epic long pin.
Other Thoughts:
This is a fun course, and while it certainly has a few dull holes, I think the pros outweigh the cons, and with the great maintenance that is put into this place, this should remain a good course for many years to come. I would like to see a few more holes in the woods and the open holes be a little longer, though. It would lessen the walk from 16 to 18 and give a little more variety. But it's still enjoyable, even if it will never be a destination course for top tournaments.
If I'm ever passing through again and want to play a course, this is going to be at the top of the list for me.