The only warranted complaint that I think people have is the whole crate thing as they said it wasn't going to have any pay to receive guns kinda thing.
Even with crates being added their plans for it are pretty awesome as they can drop anywhere on a server that you're on and it lures zombies to the location anyway, to me it just seems like an idea to bring the players to a fight, similar to how DayZ does it with their airfields and military bases.
And the people complaining about servers, bugs etc. on day 1 were fucking annoying, it's early access ffs!