Pros:
Tinicum is a great place to really let your discs fly. The major pros to this course deal with the physical pieces: the signs, the land, the grass, the trees, etc. The park is beautiful and when I played there (end of April), the high grass was newly mowed - it was only about ankle deep, so finding a disc was not too terrible.
The tee signs were some of the most informative I have seen, showing all pin positions, distances, where OB was, where water fountains and bathrooms were, and even pointed to the next tee.
There were multiple pin positions on each hole (most had 3, some had 4 positions!). Reading some of the other reviews, there is a new feature to the tee signs: there was a rotating dial on the sign post displaying which position the tee was currently in. Seems they took a page from Tyler State Park and it is helpful, though most of the baskets are visible from the tee.
Tinicum has an average mix of hole variety: open, wooded, semi wooded. It leans to the open side, so big arms will love it.
Navigation was fairly easy. I only had to break the map out a few times (between 4 and 5, and 9 and 10).
Cons:
After a while the holes were starting to get similar. A lot of the holes for me were a "routine 3" - drive, upshot, simple putt. They were just far enough where a reasonable 2 was out of reach and a 4 would have been frustrating. Most of the baskets are unprotected and the greens are wide open, providing no obstacles on upshots or putts. Placement wasn't much of an issue on drives. It didn't matter if my drive totally went flippy on me because there wasn't anything to punish a bad shot (on many holes).
The canal only came into play on a very poor shot or a stupid decision to "go for it" and then a big-time miss.
The tee pads were average: natural stone, but well defined. Only once did I notice major unevenness, though.
Elevation was almost non-existent. It is a pretty flat course.
Other Thoughts:
Tinicum is a good round of disc golf. There is natural beauty and awe while giving you a place to rip some drives. And though the technical aspect of disc golf falls short, the multiple pin placements will give variety to those who frequent the course. I really liked the mowed fairways and mowed paths from basket to next tee. This was definitely a well manicured course and that made the experience enjoyable. Overall, I had a good time but the challenge and variety were not there for me. It is still worth a stop if you are in the area.