Ground Pound is a new move in SVN version.
I found it hard to use effectively in any situation. The game is so fast that it's impossible to 'land' on a player with it, and it's more a punishment for crouching near a edge. It also act oddly with pushers.
It doesn't do that much damage. Maybe it would work better with a area of effect...
I usually prefer 'simple' gameplay with a few moves but many possibility. But I can live with this new one once I'll be used to it.
Please Play SVN to get your own opinion

Edit : Poll rearranged, You most likely find it annoying because it happen by accident