Is it me or is YM volume up alot? I bet you could get an instant fill on 10 contracts during many parts of the day. I only trade 1 but its good that the market can handle big lot sizes.
YM has good intraday swings but I understand your point. If there are less intraday swings than when markets were being thrown all over the place all day then you can argue you are getting better liquidity-at-price.