See, looka here,
Number 1. anime girls... well.... they were created to maintain the same behavior and will not change unless the plot depends on it. Real girls can change they behavior in 2 seconds if it depends on takin yo man!
Number 2. Anime girls almost always look good... couldn't say the same for some of my sistas out here.
Number 3. Anime girls almost always have.. um.... assets also. Personally as a girl i get a lil jealous
But all in all anime girls are great... but they are fictional for a reason. You can't conversate with them, but you can have them as a poster on your wall!
Real life girls are not always great, but when you find the right one i assure you she will be way more better than any anime girl!