1: The OST
It is one of the most beautiful osts of any anime I have seen :)
2: Great Character development
Especialy with Rukia and Orihime... I feel like it makes pairing choices very difficult
The characters are done so well, you can really connect to them and feel their emotions.
3: The comedy is fantastic
In the beginning... It makes up for the lack of intense fight scenes.... hehheh
4: Opening Themes~
I love almost all of the opening and ending themes for this show!!!
5: The episodes flow together very well.
When I first watched bleach I could do a Marathon very easily because the episodes were interesting and always made me want more (My record for bleach is 22 episodes in one day

)
6: Going along with character development, bleach has LOTS of great characters!!!
I love almost every character because all of them are so different, there is a character that everyone will like.
7: The chibis!!!
Tite Kubo is very good at drawing chibis and making up funny expressions for them
8: The art style!
In my opinion, Tite Kubo's art is very different from many art styles we see now.
9: Going along with 8, comes the Animation!
As far as I could see, the animation of bleach kept it's quality during fight scenes... Which is somewhat uncommon for shonen series.
10: THE FIGHT SCENES!!!
I love bleach for the fighting (as do most people) The fights are always very unique for each character because no power in bleach is alike... Plus most of the powers are really cool!
11: This anime is one of the "Big Three" (One Piece, Bleach, Naruto)
It is a 'Classic' so it's a great series to start out with if you want to watch anime. It gives you a great feel for a typical shonen series. (I would know because it's the first anime i've ever seen besides DBZ, it got me hooked

)
12: Hot Characters
((Alot of people watch anime for hot characters...

So if your one of those people, bleach is one of them...))
And the final reason to watch Bleach is...
13: Bleach is Bleach!
Its hard to say why this series is so good... Its epic yet funny, simple yet complicated... And the perfect show to ride along with for 367 episodes!