I had a great game with one of my friends this week. He has wonderfully painted Orruk War Klans. I decided to try out my Mega Gargants. My models were all painted by White Metal Studios, and they are absolutely gorgeous. Because I knew how great every model on the table would look, I also brought out some of my Green Leaf Terrain.
Kragnos led the charge, but it was really a great game. I had never actually played with those models before, and my opponent was very experienced with his army, so my butt got utterly destroyed.
Having done no research. I think the key to giants is making sure your entire army hits the opponent line at the same time. Mine kinda came it at different times and it allowed him to put full firepower into an individual unit.

Turn 1 I just pushed up the board.
Turn 2, the game was balanced.

Turn 3, I was skewered.
