I remember when I first started watching SPN...and I remember my reactions and thoughts, and some of my cousin's, as she watched some SPN episodes with me. So I will post them here because it's interesting...

THERE COULD BE SPOILERS, so if tu haven't seen SPN Season 1 and don't want some of the plot dado away, then don't read till you've seen season 1.

Pilot
Of course, the first episode watched of SPN was the Pilot... I thought it was the best Pilot ever.
I knew from the segundo I laid eyes on Sam and Dean, that I would watch SPN forever. If they weren't in the show, I wouldn't watch Supernatural. Not because they are hot (ok, maybe a little), but because their characters are AWESOME, and unique.
My cousin, who watched SPN with me, liked the Pilot a lot, but dicho Sam and Dean were annoying. I asked her if the actual characters were annoying, o if their appearance and how they looked was annoying. She dicho everything about them was annoying, but "oh well, the show's good.". I still haven't forgave her XD.
I got a crush on Dean Winchester about 2 episodes in.

Bloody Mary episode
My cousin couldn't stop complaining on how annoying Sam and Dean were... in every episode she had to say something mean about them... that Dean had stupid jokes, o that Sam was whiny.
But, she really liked the Bloody Mary episode- and actually laughed at Dean's jokes. She's really fond of urban legends like Bloody Mary/Hookman. She dicho it was a scary and fun episode.
I had to bite my almohada to stop myself from laughing at some of the things that the boys argued about/said/did.
My cousin really liked the Faith episode.
por now, I had a crush on Sam Winchester.

Bugs
Despite the Bloody Mary episode (which my cousin enjoyed), she continued moaning about SPN and it's plot and how boring it was (I seriously wanted to puñetazo, ponche her then). This episode made her hate SPN even more. She wanted to stop watching SPN, but I started nagging her, and she agreed to continue watching. I was confused about the way it suddenly became day, after 4 minutos of spraying bugs with god knows what.
I had a full on crush on Sam, and kept on taking fotos of him whilst watching episodes...I think it pissed my cousin off XD.

Nightmare
I was COMPLETELY into SPN por the 'Nightmare (1x14)' episode. I was hooked and looked adelante, hacia adelante to every night (we watched 1 episode of SPN each night).
My cousin sighed wearily whenever we had to watch SPN. I was getting sick of her not liking supernatural :(.

Later on
I couldn't stay away from SPN. What true fan can?
So I watched a couple episodes when she was away.
She asked me later on if I wanted to watch SPN again. I dicho maybe, because I knew she didn't like Supernatural, and I didn't want to force her to watch something she finds annoying :(.

I then went back inicial to London, and was free to watch as many supernatural episodes as I wanted to! I went crazy. I re-watched the first season in 2 days, and watched a couple of misceláneo episodes too.
I actually felt like crying when the car crashed.
My cousin Skyped me that her friends told her the Impala was in a car accident, and she actually sounded happy. 'WTF??' was my reaction.

I started watching SPN Season 2 the día after I finished with Season 1...
You'll have to read my other articulo on what my reactions were to Season 2...
Click link to read it!

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Reactions to Season 2- Click link.
Reactions to Season 3- (out soon)
Reactions to Season 4- (out soon)
Reactions to Season 5- (out soon)
Reactions to Season 6 (the bit that has been aired)- (out soon)