"-this game will sometimes not respawn you after destroying an objective"
This has happened to me before, I think it's related to have "W" pressed when you respawn, but I'm not sure.
"-the guns can magically lose their loaded rounds"
This happens if you cancel a reloading. The most common mistake is to start running while reloading.
"-this game needs more maps"
The developers have promised more maps in future updates.
"-this game has friendly fire which s up the co-op badly"
It's not easy to kill a teammate, but yeah, maybe they could disable it in co-op.