I can work around check in/check out times.
What annoys me about the Provincial Park reservation system is the fact that I can only book sites large enough for my >32ft RV, but someone with a tiny 2 person tent can also book the same site. I know I can't physically fit on a small site....but Large sites should only be available to larger campers.
We went to Killbear to try and get a non reservable site, we drove around to find a site only to see all the large pull thru's occupied by tents and the small tent sites empty!!