Offline, cranking the attribute effect slider up to 9 or 10 seems to make non-superstars completely incompetent rather than making the stars actually shine. Also, due to the goalies in this game not allowing any realistic (found a hole) goals if you will, it makes playing with the bottom-6 guys a total chore. Basically you have to shoot for rebounds or not use LS because they will easily send the shot wide by a mile.
This is why I use a more all-star type roster offline and tune the game based on the default 5/10 attribute effect. If the game is going to have predictable goals where you basically have to take the perfect shot, or do a perfect one-timer to score (assuming you crank up the goalies so they're not default swiss-cheese) then I need predictable results when playing with my skaters.
This game is a better game than NHL2k10 imo, there's no doubt that all of the mechanics in EA's game are a great foundation for a great game. The slider adjustments only add to how good this game can be. HOWEVER; there are a few areas that totally make this game feel a lot worse and less immersive than NHL 2k10 and that's the only reason the 2k series still gets brought up to this day.
EA's goalies are so horribly unrealistic. They can move laterally like they're a bubble-hockey goalie being whipped around by a 5 year-old, and of course all without seeing their legs move! How does a goalie move without moving their legs LOL!? Unlike their 2k counterparts, you'll almost never beat them with a quick snap shot from a seemingly non-dangerous player. The 2k games were so good at having unpredictable goals. 2-on-1 with bottom 6 forwards, the pass isn't open so I just take a quick snap shot and BOOM! A completely unexpected, yet realistic goal that felt so organic! Not to mention the fact that 9 times out of 10 that goal doesn't go in, but for whatever reason that 3rd liner beat the goalie under the arm for that one and it was so so good to see. The 2k goalies also had momentum and actual animations that proved why the goalie was able to recover. On breakaways, they didn't drop into the butterfly and then move across the crease 10 times as that's physically impossible, they actually could get really faked out like a normal goalie, and sometimes they'd make a huge save by diving back rather than just being a bubble-hockey goalie.
Last thing to note: shot accuracy. Why in EA do shots either miss the net or hit exactly where you're aiming? This is what causes so many goals and makes shooters feel the same no matter what. I want to see the difference between Ovi's 1t being able to hit good spots more often that Tom Wilson's. I don't need Wilson to miss the net all of the time, but make his shots go low when you're aiming mid, make them hit center mass when you're aiming to the corner. Stuff like this should result in goalie attributes mattering more (rebound control) and it should make for more scrambles and organic gameplay in-front of the net. This is all stuff that 2k had that EA can't seem to figure out. The game is a lot closer to being an exceptional hockey representation, but legacy issues continue to plague this game with no end in sight.