Pros:
There are easily birdied holes, and holes which will strain par for many. Being very close to Lake Charlevoix (and in turn Lake Michigan), there can be very high winds and it's almost always gusty somewhere on this course.
I cannot say this park is ever trashy, or in disrepair (aside from the tee signage). Overall, it is very pleasant, and when the wind is blowing and the leaves are in bloom, it is extremely challenging. Don't let the short distances fool you. The elevation coupled with the trees make you need to hit specific lines on most holes, and one false move will mean double-bogey at best..
The scenery here is quite impressive, especially during fall colors. While it is unfortunate that the course follows the main road access for the majority of the round, it means that surrounding animal habitats have remained intact. Less common birds like woodpeckers can often be sighted.
There are two nice observation decks at the top of the hill, so you can chill and look at the bay when you finish. Lots of pleasant locals use this for all sorts of training. Local kids hang around the front 9, while the back 9 is usually less crowded.
Cons:
The tee signage has been destroyed on the later holes and the old 18th hole, which used to end opening to a dead shot of the lake, was removed and rerouted to the side of the summit. I guess people sitting on the deck got hit, as it was a blind drive. (don't people know what FORE! means?)
The long (and I mean long) distances between many of the back 9 holes severely disrupt any rhythm you may have developed, and you spend a lot of time wondering as you walk and look at the land, "why isn't there a hole here...or here...or here?" There is sooooo much more room on the back 9 to easily add another 6+ holes, that I cannot conceive an acceptable reason for this to be only an 18 hole course.
There are no water holes, but if you bring your dog, that is sometimes a plus.
The tees are dirt/gravel, in rather poor condition, and can be very loose after rain. The majority of the baskets are old rusted single chain design, but a few new Chainstars are on the back 9.
Other Thoughts:
This course is close to my home, and although it isn't my Local course, I have chosen to drive and play this one dozens and dozens of times. I started playing frequent rounds on defunct ski hills, and really like the elevation changes and workout. Although there is not a big bomber down the hill to end the course (it is EXTREMELY steep. There is a reason there are hundreds of stairs down), this is my favorite course in the area. And after you finish the stairs, there is still a respectable place to stop and empty your bag.
Note: when I searched for courses in my area, this was categorized by DGCR as "moderately hilly" rather than "very hilly" like Hickory Hills. I must disagree, as the back 9 is a long hike up a big hill. Be prepared to work.
***UPDATE
There is another hole that has been installed after #9 to replace the old missing hole #3, returning the course to 18 holes total.
***
If there were 6 more holes installed on the back 9, this course would immediately improve to a 3.5 rating. The blantant waste of perfectly usable land is quite unforgivable.
Further adding a practice basket to warm up at the bottom, adding concrete tees, and replacing the tee signage would elevate Avalanche to a 4 rating, without hesitation. The core of the course has a sound fun/challenge factor, but the execution of the course is underwhelming.
This course is 5 minutes from Boyne Mountain which houses another nice 18 hole course. Playing both is a fantastic workout. However, if I have limited time, I choose to play Avalanche. Although it is roughly the same workout, climbing Boyne Mtn just to get to hole 1 always makes me choose Avalanche.