I really liked the first episode. Definitely going to keep watching.
If there's anyone else like me who felt they could do with more info on the characters & the backstory, but don't want to risk Wikipedia etc. due to spoilers, then have a read of the official Viewer's Guide on the HBO website...Loads of info, without (presumably) giving too much away.
http://viewers-guide.hbo.com/game-of.../guide/houses/