As the happy owner of an Islander 36 I will have to say they are a great boat. Roomy, fast, and a joy to sail. As an offshore boat...they are not. However, a number have cruised offshore and around the Pacific sucessfully.
The Islander 36 is an excellent coastal cruiser but a large, deep cockpit with small drains, doesn''t fit most seasoned sailors ideas of an "offshore cruiser." That doesn''t mean the boat couldn''t be adapted to make it more suitable....it just wasn''t designed to be a blue water boat.
I''ve owned mine (a ''78 by the way) for six years. I just love the boat and haven''t seen anything in the price range that I would want instead.
Suggest you check out the Islander 36 Association web page www.islander36.org/
You will find a wealth of information about the boat, maintenance concerns, and lots of good pictures!