Hi inbetween and welcome aboard!
An interesting read :) Some similar themes with others who find their way here of course.
I will address some of the things you have brought up as pros
encouraging bible reading, going to the source, other religions often do not bother or even not believe anymore in Gods word.
The bible is central to my beliefs and millions of others. But then I am a born again Christian :)
preaching work, ok others done it too, but not to the extent as the JW, also not about the kingdom,
IMHO opinion, not true. This point was raised also by my JW friend so I assume the believe propagates from WT spin. "Preaching" is not only door to door. I am preaching the Kingdom now! Also, as you have found, door to door is not effective at all. Now, if you want to see some effective preaching then watch this. This ministry has seen 40 million enter the Kingdom alone! There are over a million at this one meeting :)
Lagos,Reinhard Bonnke
What is really important is what kindgom are the WT preaching? Is it this Kingdom?
Luke 17:20-21 (New International Version)
The Coming of the Kingdom of God
20 Once, having been asked by the Pharisees when the kingdom of God would come, Jesus replied, "The kingdom of God does not come with your careful observation, 21 nor will people say, 'Here it is,' or 'There it is,' because the kingdom of God is within [ a ] you." The Kingdom of God that is within you is where the Holy Spirit lives, where Christ is King. Read here where Jesus talks about the Holy Spirit
John 14 neutrality, as a group known for not participating in war, ( WWII, Ruwanda etc)
I won't bother debating this too much as it is not a core issue for me. I am for peace and I hate war. However, I don't not know if the bible calls Christians to never take up arms. If we hadn't then Hitler's regime could still be in power now! Lasting peace will only come when Christ returns. Until then, we are to be peacemakers first and foremost.
difference to some confusing teachings in Christianity, like trinity, immortal soul, hellfire etc (I read some of the arguments on this site, they just didnt convince me otherwise)
OK, read your bible. It is the highest authority. Let it judge doctrine and theology, not man. I highly recommend you read pretty much any bible save the NWT. That said, you will still find the NWT totally contradicts some of the core WT doctrine. See the recent thread on the Holy Spirit not being a person for example.
promotes a life, which is not so bad, shields of many bad habits common in world today, gives hope etc, therefore bringing out the best in some people, also bad things though in others...
For me, life only comes via the Holy Spirit living on the inside of the believer. See John 14 again and here for example
Titus 3:4-7 (New International Version)
4 But when the kindness and love of God our Savior appeared, 5 he saved us, not because of righteous things we had done, but because of his mercy. He saved us through the washing of rebirth and renewal by the Holy Spirit, 6 whom he poured out on us generously through Jesus Christ our Savior
Notice the verse talk of being born again, "rebirth". Also that God is our Saviour and also Jesus Christ is our Saviour! Also of God's grace, salvation is a free gift, not because of "works".
Anyhow, stick around. You will find out much info regarding dates, doctrines and stuff. If you really want to continue seeking God (which you obviously do) then you are ultimately going to have to leave or else dumb down your conscience and keep up the pretense.
All the best,
Stephen