Oh dear god......
Stay as far away from this game as you can until the developers get the issues fixed and right now, it seems like the stress on their servers is what's killing the experience right now. Also even if you pre-loaded the game through Steam, expect a large update to download before you can play it.
-It can take multiple completions of a training mission before it'll actually be registered and next mission will be unlocked. Not only that, you can complete a training mission and it'll tell you that you failed it. I had to play the obstacle course and m16 training twice before they were finally recorded. Then even after two perfect tries, it still wouldn't record the weapons familiarity training.
-Joining a server is nearly impossible, you'll get a loading screen when you join a server, but then you're thrown back to the main menu without any kind of message.
-When you do join a server, it's so laggy and the gameplay is so choppy (despite graphical settings) that it's not even worth attempting (training missions excluded of course).
-Logging in can take forever.
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You shouldn't have to worry about bunny hoppers because you can't jump anymore, but you can instead vault over obstacles.