Supernatural - a quick question

After hearing so many wonderful things about Supernatural from many respected soucres, I finally managed to get my hands on 11 episodes of the first series. 

I finally got round to watching the first episode yesterday. It was interesting, increasingly clever after what I thought was a slightly slow start (and I felt awful for the way the poor blonde girlfriend came to such a sticky end just to get Sam back on the road), but I wasn't connecting with it in the way that some people plainly do. And the nightmares last night didn't help much either!

So I suppose what I want to know is - is there any point in carrying on watching it, or is the first episode representative of the series? Will I get into it as it moves on, or is the first part as good as it gets?