Do you think Roanoke Island was a good location to settle a new colony?

No it wasn't,

Explanation:

Because many people have vanished there which is why the colony who was missing is called the "Lost Colony". It was maybe a good idea to them to go there but if they knew now about what happens there they'd probably re-suggest a new island for the entire colony.

all of them lol cause theres no map

explanation:

allergens: overstimulate the nerve system

neurotics: attack nerve cells

mutagens: damage or otherwise alter dna sequence

generators: cause defects during growth and development  

carcinogens: cause unchecked cell growth

i hope you get the idea according to me these are the effects that happened.