The main campaign game mode, Invasion, will make an entrance in single player in 0.90. In that, you carry your profile, stats and items, over map changes just like in Invasion Online.
The matches you play in single player in the current version are just quick single matches where you openly choose the settings.
I'm not sure I got the remark about many AI and high rank.. but in Invasion, XP and rank progression happens on 20% pace compared to single player matches, so it does indeed take longer to rank up
