Signed up myself and am enjoying it so far. I expected to at least be setting some traps for nosey agents by the end of the day, but after about 8 hours of back and forth cleaning/checking mission status, I finished the day with a tech lab, barracks, mess hall and an upgraded control center. No real action- just farmville type play style, build then wait then wait some more, then collect. There aren't even 5 minute missions that I can lure myself into believing I'm controlling the game. Some of the downsides may be because I'm new to the game, but it also seems like I will not be able to play this game on my own. I will have to be that friend that spams my facebook wall with invites to get items that can only be obtained through friends' gifting or spending diamonds. Having said that, I'm hanging in to see what developments come.
In more advanced levels, can you build traps and such?