Inferior screen. Lenovo wants just below 1000 Euros for the Ideapad. The high price strongly demands the delivery of an outstanding all-rounder. However, Lenovo cannot serve with this. The same issue as seen in many Lenovo laptops that we have recently tested is found again: Price and performance are not inline.
http://www.notebookcheck.net/Lenovo-Ideapad-500-15ISK-Notebook-Review.166579.0.html
As for the terrible PWM frequency. Are you sure the screen refresh rate in display properties was set to 60 Hz ? Intel tends to change it to 50 Hz when running on battery that makes another flickering or "waving" effect.
The keyboard is terrible and low visibility in dark environment.