You can make quality replays with instagib. They just don't focus on DMs. Nobody's going to be impressed by instagib boomhits, but if you do something interesting, fluid and acrobatic and it happens to have swords in it I think it's worth watching. :/
With that said, the second one was cool. The opener looked a little lame, but it sure had a lot of power. The jump was all right in the first one, but it just sort of ended with you falling on him with your blades and exploding him. That wasn't too exiting. Maybe it would be improved with a more interesting attack.