I'll concede that if you're talking about the trackpad, Linux is disappointingly bad compared to Windows. It's really really shaky, scrolls up and down with a shockingly massive jitter. You start to wonder if the trackpad itself is malfunctioning. Sadly, the same trackpad works so much better on Windows.
This is mainly about the pointer / trackpad drivers to be fair, but it's still a freestanding issue that has the potential to really bug someone using Linux on a laptop. It gets so bad I have to carry around a mouse.