siri isn't as smart as I thought

siri is really cool, but I've found quite a bit of flaws... for example, siri doesn't know the difference between 2 1/2 and 1/2 ... and it doesn't understand if you say what is 2.5 divided by two... it writes down what you said correctly, but siri doesn't process it. or if you tell it where is there good chinese food it works but if you say where is some bad chinese food, it should give you the same answers but in reverse order, but it doesnt.. its not as smart as i thought..