What may have discouraged folks was talk about how viable they would be in the northrend instances. If you don't plan on doing instances with your team than you should have no worries as they are hilariously fun to play. When I leveled my 4 locks and priest team thru outland northrend I used 4 felguards and they tore everything apart. I would wand with my main and then use my pet attack macro cuz alot of times they would kill so fast throwing dots would just be a waste of mana...

I only used the dots on elites and group quests.. In normal instances they did fine. I used a ping pong effect with my pets on the bosses and I would only lose 1 some rare moments 2 of my pets. Heroics are a totally different beast though. Even the trash started giving me a run for my money and bosses would eat my pets like sushi. They are hilariously fun though in BG's.