I'm a 95% PvE player.
I have found the Necro/Reaper to be Easiest for me. I can pop a couple minions for meat-shields and wade in on full tank-mode as a Reaper or stand back and use the staff for some AoE damage.
Every time I try to play an Engineer I find there's too many options and I'm overwhelmed. I'm going to try again from Lvl 01 and focus on one aspect, maybe turrets.
"That's what" -- She