My good deed of the week for the community. It is a common misnormer among ET community, that the YM is suitable for the futures beginners. It is far from the truth.
YM, even though, the tick size is only $5 per tick, can be extremely noisy. Unless, you're an experienced trader with impeccable entries/exits, the noise alone would require about 15 to 20 tick stops. That's $75 - $100 risk per trade off the bat.
Assuming the trade goes your way, it is uncommon for the beginners to ignore the noise, and to ride out the profits to at least 40 ticks, essentially 1:2 R/R to make it worthwhile. A beginner would be itching to take the profits at the first sign of green. It would be a losing game after a few plays, due to poor risk, reward ratio.
From my experience, NQ is the most beginner friendly emini of them all. The tick moves in .25 increments, instead of whole points, and it is still $5 per tick. And It is very rare, that you have to risk $100 (20 ticks) in NQ.
Happy trading
Schaefer
EDIT: I just saw your reply above, ER2 is even worse, ER2 is essentially YM on steroids (make that lots of steroids). If you want proof, just take a look at the journals section, take a look at a couple of journals recently started by newbies, trading the YM. The results are what you would call, "expected".