?
I haven't found it that much of a grind, i am level 50 and then some and really enjoy the pack opening, if all the cards were unlocked I wouldn't have played it half as much. To me that's the reason to play. I've never had back to back full sets of repeats though, and since second patch I've had at least two new cards in every pack and I was at about 10 left to unlock before they dropped the 35 new players and extras in New teams...*
id love some sort of season mode or proper custom tournament mind you....
that would make the pack system even better*