I think not only me prefer our Gromm over the AU Gromm.
But with the new cinematic i really start to respect that guy. It was so easy to accept Gul'Dan's help and drink the blood, but Gromm is really the orc with Iron Will.
And then it was really painful to watch him looking at how his people curse themselves. Now i hope Gul'Dan won't turn him into the green brainless monster.