Twitter was absolutely special when it came out. It was the first (or at the very least first successful) social media designed for mobile use. It also had large effects on how people thought about and used social media, and had big impacts on the ways various companies and people interact on social media.

I've never particularly cared about twitter personally, I used it a handful of times here and there, and I agree that currently and for a while it's been a pretty shit slice of social media. But saying it was never special is a stretch at best.