I mentioned this during the last beta but it is still a problem. The only way to level up and get skills and upgrades is through ranked (multiplayer) this is a problem because I hate multiplayer and I know many people agree with me. I do not want to play multiplayer and that means that I will not get any skills and upgrades which kills replay ability. If you could make it where skirmish and ranked upgrades and skills are seperate, than you will not have anyone abuse the skirmish mode to get them and it allows the people who hate multiplayer, like myself, to have fun and enjoy the game to its fullest.
Small little thing real quick, if you do what I said in my post, I hope you do not just give us the skills and upgrades because I would love to unlock them myself but do it through skirmish insted of multiplayer.