All my experience is casual, so take that into consideration.
I played Dash a fair amount in 1.0. Played with him a bit in 2.0. My experience is that he is very swingy; I either have a good game where my dice don't hate me and it feels like a chess match with a glass cannon that pays off. Or things survive on 1 health and hang around and I get beaten badly. He's still fairly predictable and relatively easy to block. When blocked he burns down.
I have to think one would have to be a pretty good pilot to make Dash seem unstoppable. I don't see him as being anywhere near as good as 1.0.