Season 1 was brilliant but then I ran out of time to keep up with it. Glad to see some positive feedback. Guess I have to add it back into schedule.
You probably want to start over. I watched the seasons when they came out, was confused in season 2, more confused in season 3 about who was who again and what happened before. I don't remember the ending of season 3, just remember being confused and ready for it to be done. Season 1 was excellent, but I guess you need to watch them right after the other unless you have perfect memory :)