I have yet to come across a griefer/ganker. No doubt they exist, but only in heavily populated areas where a lot of noobs hangout. By travelling just a few light years out you won't meet another soul for weeks at a time. In my opinion, the forums are littered with negative comments, but thats only because FD is quite active in the forums and people expect improvements. On the whole I don't have a problem with the game.
Piracy is part of ED and is based on a risk/reward model be it a NCP or a player that is out to get your cargo. They are not there to blow up your ship, they just want your cargo. I have yet to meet a player pirate, but there is only one thing they will get from me and that is projectiles from the wrong end of my multi-cannons.
There is also a lot of players out there who go about helping the noobs. If you find yourself in trouble message someone in-game or on the forum and there'll be volunteers more than willing to help you out.