I have been renting games for my two little boys (3.5 and 5 years old) to play.  We rented Lego Star Wars the other day and they loved it.  I thought it was good also and will probably buy it.  Today I rented Amped 3.  Not real excited about it.  The boys thought it was okay but they weren't juiced about it.  Unlocked a couple achievements and will probably get a few more before I return it but overall, I'm not impressed.  Played a little Gears tonight.  Finally killed my berserker and finished level one.  Had to quit to watch Lost.