Why is Sin Cara getting so much hate?

I've only started watching WWE pretty recently (~1-2 months ago) so I haven't really been watching when Sin Cara had his main screen time, but I've watched a lot of his matches and I have to say I find him pretty entertaining to watch, if only for the fact that his wrestling style brings something new to the table.

He seems to be getting a lot of hate though and doesn't have any screen time recently, why is that?