I've reallyonly seen Borneo all the way through, then reasonably sized chunks of Marquesas, HVV and One World. One World was the first season I ever tried to watch live and I watched enough to know I didn't like it.
The others I enjoyed though! Marquesas might be a bit weaker but the parts I saw (in the middle) were interesting and enjoyable.
I'm trying to decide the next season I want to try watching. I'm more or less spoiled on boot order and probably the twists of each season, but not really how it all fell together.