Disagreed, there is many builds that require corner jumping, including a default gamemode
It's more often abused than used. And it's very unreliable if you're using it in builds and really looks bad. The same thing could be achieved with an add-on, easily, so even if it were fixed, people could still have it.
you are restricted to what you can upload
Since when? Each workshop has it's own rules and limitations.
stuffty subscription system that works only half the time
Works just fine for me.
horrible navigation.
Depends on how the devs set up their game's workshop. Blade Symphony's and Space Engineers' both have properly organized workshops.
In gmod I end up having to restart up to 20 times before I am actually able to play.
Seems like a problem on your end, or a problem with gmod. I don't even have to restart Blade Symphony to use workshop content I downloaded while in a server, and that game is in early access.