Pure Class Decks?

[radicalshift]

I am new to TCG and a vanilla WoW player. I built several decks that are works in progress
(more quests than I probably need and less ability/hero/item cards, but the decks work).
I am curious what some of the more advanced players think about decks that are all the same class.
The coolest one I have so far is a Jaina mage deck. It seems to have a lot of survivibility and card generation.
Another one that is fun is a Balance druid deck. I'm just starting local tournaments, so I'm sure I'll see soon enough, but I'd like to see some discussion about this topic.
Thanks!