It depends on your goals, but race to 80 and farming few lvl80 heroics can be boring soon. If you care about levels, dungeons can be slow. There are really nice instances between 60-80 where you can master your skills and after each full clear you can feel small victory, something that won't happen with just questing. Also you can do the dungeon quests for more exp and rewards. :thumbup:

I've got the same class setup as you and I love their awesome synergy. I enjoy the slow leveling in instances, learning to control the team in every situation and gathering rare loot. Just finished BRD and the two months with them were great fun until now.