I know players that devote thier entire time playing wow to pet battles. Collecting, leveling, pvp pet battling, the game is what you make of it and no aspect of the game in general should be referred to as a "minigame". Different strokes for different folks.
I play both PVE and PVP with my warrior, the changes to disrupting shout are a slight annoyance on the PVE side while bieng a much larger annoyance in Arena. IMO this strikes a good balance. I don't believe there should be any modification to the current implementation. It was an obvious assumption that warrior interupts were broken in both aspects of the game and changes were made to fix both.