One of my best friends is a Sagittarius!
Forgive me, but astrology is a sort of fascination of mine.
I'm a Taurus. I really enjoy being one! I can certainly admit to being stubborn and slow-moving at times (moving at my own pace, as I prefer to say). I also really love people and the beauty of nature. Taurus is ruled by Venus, which, in and of itself, says a lot about most of us born under that sign.
However, sun signs (based solely off of the day that you're born) are not enough to really get a good picture of who a person is. I always make this argument; if you feel that astrology has got you all wrong, you just aren't looking closely enough. Everyone has moon, mercury, venus, etc. signs that say something about them. I'd say that the moon sign is really the second most important sign after the sun sign, as it is often considered to be a person at their deepest level. Mercury is how you process thoughts, and Venus is how you love, for example.
Moon signs are really, really cool. My moon sign is Scorpio, and I feel that it defines me perhaps more than my sun sign does in key ways.
At the risk of sounding like some crazed gypsy lady, I'll shut up now. I just think everyone should check it out; looking more closely at astrology helped me understand myself a lot better.