Coming from a 2002 BMW 330ci, the Lexus IS 350 leaves a lot to desire. My main concern is the transmission, first of all they don't even make a manual transmission for the car, second of all, the "manual" shifts with paddle shifters are horribly delayed, it's at least 1.5 seconds when I am driving hard, this defeats the purpose of a high performance car. Even the 02 bmw had faster steptronic shifts. I agree with the quick acceleration and engine smoothness. My second concern is the handling, the car feels heavy when taking turns at +/- 25mph speed. Suspension must be improved a little bit. Aside of those two things I think the car looks great and its got a really nice "classy" interior.
Standard leather interior, heating/cooling seats, back up camera, nice standard sound, excellent headlight lamp illumination, engine feels powerful and quiet.
SHIFTING TIMES! Handling (therefore suspension), navigation system must be improved a lot!! Integrate google maps, that would make it perfect! :), gas mileage is not that good and somehow more leg space is needed.