There's a few things for me.
1) 607BCE as the fall of Jerusalem just doesn't add up and as a result neither does 1914.
2) The 'generation' should all be dead now, resulting in a change of doctrine to an 'overlapping generation' (this is in fact 2 generations).
3) The great crowd. They say the great crowd is on earth. However the verses in Rev 7:9-11 show that the great crowd are in the same place as the angels, the elders and the 4 living creatures. Rev 19:1 tells us that the great crowd are in heaven.
4) Jesus is the mediator for ALL mankind not just a select few.
5) The memorial is a practice of rejecting the body and blood of Christ.
6) The GB have assumed the leadership of Christ.
7) The WTS are false prophets and have gone on to deny it. (End of the system 1799, Christ's invisible presence 1874, Armageddon 1914).
8) Truth NEVER changes.
9) Denying members the right to study the srciptures on their own without WT publications.
10) Disfellowshipping someone for holding different views. Resulting in total shunning by family and lifelong friends.
11) Control of everything you say and everything you do. Leaving very little to individual conscience
Finally Jesus said 'You will know the truth and the truth will set you free. Well, I feel trapped and imprisoned, so it can't be HIS truth!
Please don't attempt to argue against any of these points.. they are just my own personal views on what has convinced me to get 'mentally and emotionally' out. I am a born-in of over 50 years and baptised almost 40 years, I've been a pioneer and elder's wife. This is just a culmination of all those doubts building up over all those years. Like many others here I've discovered the 'Man behind the curtain'.