Only had this thing a few weeks now, and it is awesome. Traded in an 07 Highlander which I also loved, except for its interior finish. After 2 tanks of gas I am averaging about 26 mpg with mixed highway and city driving in the RAV. Gas mileage going down the interstate is best when I cruise at 65-70 mph. To me and my wife there was not a huge difference between the 4 and 6 cylinder models performance and as such we did not want to fork over the extra cash. The interior on the Sport is far nicer than the base model for not much more money. The only thing I wouldn't mind having is the 4x4 as our Highlander was AWD and that worked great in bad weather. Overall very happy with the RAV.
Interior design and color, Gas mileage, nice performance for a 4 cylinder and it does not feel like the motor is being over worked.
Floor mats should be standard. Other than that, nothing I can think of.