- Not providing the list of events in a timely manner Define timely, is it in the catalog before the con starts?
- The price of admission (I personally don't mind the cost given the OK-ish prize support, however, considering the fact that non-paid judges end up running the show in place of Past Times employees, it's a little frustrating) That is an issue for the judges not you, if they want to work for free(an assumption i don't believe is true) that is up to them.
- The lack of space for casual play (this is likely a GenCon issue and not a Past Times issue) By casual play, I assume you mean somewhere to play that isn't an event? I see casual players everywhere that isnt being used by paid events (floors, hotel lobby, etc).
- The lack of organization regarding the space - multiple events are moved without notice (once even DURING game play, for me) This could be an actual issue related to the event organizers (still not a Gencon responsibility)
- The timeliness of the events (though if you've ever played at Past Times or another event hosted by them, you know this is all too regular) What, they start late, run long? If they are late starting it can be brought to the attention of the GC coordinators that are usually in the area of large halls.
- The cut-off time for scheduled events (this may be regulated by GenCon, though I am unsure) That would be controlled by Gencon, but i've seen events added as the con is running so...
- The lack of constructed un-scheduled events Yea, no, got nothing here. Lack of un-scheduled events, really?
- Failure to maintain a coherent prize wall system throughout the entire 4-days Quality or just disorganized?
- Scheduling events that will knowingly not draw interest in favor of events that will. There were four of us playing Frontier one year. There is no Legacy this year. Seriously, why wouldn't they have daily legacy events?! I would guess they schedule events based on what they think people will play and what judges they will have.
Anyway, there will be the same complaints this year as in past years. I personally know multiple folks who have reached out to GenCon with these complains in hopes that there is something that can be done, but nothing ever is. I really hate it, but not enough to not play. It's just too convenient to walk to the convention center from home and play a ton of magic.
If you don't like it, organize your own group and run some events. You don't have to organize every event for MtG but if you don't see the events you want get some friends together and do it yourself.
Unless the organizers violate the Host Policy there isn't much that Gencon will do. By the way, bullet point 4 IS the kind of thing that can get them in hot water.