I've completely given up on trying to do what the coach tells me. I've been stuck on the same coaching tips for half the season and everything's been fine. I'm playing as a playmaking LW, and I don't really have any issues in getting good grades on superstar.
3 points should get me to an A-level grade, while hitting and poke checking gets me in the B-range for team play, and staying close to the opposing defenseman in my own zone on a consistent basis gets me in the B-range for defense. Got to the 1st line in 8 games and have stayed there since, with about 2.5 ppg.
The one thing that really pisses me off is how terrible my defencemen are both at covering the guy in the slot and at passing the puck up and avoiding hitting our own net after winning a defensive zone draw. It's always the same thing. I remember there was a game where I was up 3-0 near the end of the second period and ended up losing 4-3 with 3 goals being the same off-side one-timer setups in the slot. So painfully obvious, but my defencemen can't seem to cover crap all.
Edit: There are times I get A-level grades in defence or teamplay if all goes well and I stick around my guy a lot, get some takeaways, lots of hits, and draw some penalties. Happens here and there, but not often, especially for defense, but that's not my focus anyways, so it doesn't really bother me.