Movies sucking lately

Why have there not been many good movies in theaters lately. I LOVED Body of Lies, but since, probably Tropic Thunder, this has been the only movie I have REALLY enjoyed. Why is that? This summer was awesome, but the movie theater has been a barren wasteland the last two months! When Beverly Hills Chihuahua is highest grossing movie is the highest grossing movie TWO weeks in a row, there is something wrong. I hope the rest of the year isn't as disappointing as these last couple of months.