I saw the last episode this morning before work. Spoiler free reactions above the cut, one major, major, spoiler beneath the cut.
Without any spoilers I'd have to say: Good to almost the last drop. There's one aspect that was a big disappointment and the cause of a mini rant. But overall an excellent 1st season and looking forward to the next.
Come on guys, I know its comics on TV but after such intelligent and clever writing leading up to it this almost shattered my suspension of disbelief.