Oh dear...
I actually think "Tank 2007" is a good game. A bit mindless, but a fun premise and plenty of action. However, despite all that I give this game a "zero" Overall score. Why?
For the simple fact that, in my opinion, if you have to put a warning about your movie/game being a resource hog you are doing something wrong. There's a reason companies like Blizzard or Valve spend time making low-polygon models and other improvments so that even low end computers can run their games.
In the future please test your creation. If it's laggy writing a "warning" doesn't give you a "Get out of jail free" card.