I would play exclusively in Open if it weren't for malicious griefers. I am not afraid of PVP and rather enjoy a spirited fight with something other than the AI, but griefing is just too rampant. There is nothing PVP about attacking an unmanned ship. I have seen two examples of it just this weekend. Both while I was in my well kitted and engineered corvette. First I was collecting some nearby mats in the SRV and a jackhole starting firing on my ship. The shields were holding fine which gave me time to make a decision. The second was while using SLF and leaving the vette stationary while I checked out a feature, again some sucker punching B* attacks the ship, unmanned, not bothering anyone, just sitting there. To me, griefers are cowards. Real PVPers want sport. Sadly, there are too many griefers to enjoy the game sometimes, so Solo it is.
I still play in Open, but at first sign of one of those cowards, I switch....can't be bothered since they just run when you fight back.