I played a game with a T2 radar as my only pre-build structure. T2 radar is, normally, not a very good unit because it only provides slightly more range than a T1 radar, but has a much higher cost and and energy cost. It's not very good as a pre-built either because it's extremely easy to kill (particularly from bombers).
These weaknesses are compounded in GW because the radar doesn't activate for, like, 5 minutes (that's 5 minutes the enemy gets to snipe it and they have so little health the wreckage dies too) and when they do activate, they crash your energy economy with -250 (or some ridiculous number).
Why not just make it work from the beginning, but make it not use energy? Or, automaticallyturn it off as soon as it's active so that I can choose when I want to turn it on (when I have the energy).