It is fun!
Building decks is much more fun than I thought it would be...and the practice play is a fun way to kill hours and hours. Since I am staying with some family this weekend and I didn't want to be slaved to a mouse and keyboard (WoW), this game naturally caught my attention.
It is very well done, and the unpacking new packs feature is really a blast...you never know what cool new cards you can get. Once you unlock or unpack cards, you can build a deck with them and try them out.
I began with a hunter deck based on beast minions...I have had solid luck with that. I also got a silver Edwin VanCleef from a pack I got!
So, if the internet isn't very good over in the deployed location, this is another option that will not require much bandwidth at all. Perfect timing Blizzard, for once.