Overall, I wasn't able to lie to myself. I think if you've been a JW for a number of years, you know something isn't right. One comes to a point where one has to make the choice to be intellectually dishonest with oneself and remain or be intellectually honest with oneself and ultimately leave.
A brief summary includes....
1) Misogyny (eg a wife living in subjection of her husband)
2) The no blood policy
3) The flip-flop in Evolution (that happened when I was around 15-16)
4) The math not adding up (it is impossible for them to be preaching to all the inhabited Earth)
5) My increasing disagreement with Watchtower's interpretation of scripture
6) Their going beyond scriptures
7) The Ethiopian famine (this was the beginning of me questioning the existence of God - the problem of theodicy)
These are some of the top hitters that led me to conclude that religion, God, and JWs were not for me.