The "mole people" have the right approach; how much time do you plan to spend in your cabin? How long is the cruise? My wife and I, while not anti-social by any means, like to spend a fair amount of time lounging in our cabin. We also like long cruises in warm climates, and lots of sea days. So we feel the extra money for the mini-suite is money well spent, considering all that comes with it--larger bathroom with tub, large closets and storage areas, sitting area, and a much larger balcony.
However we were completely happy with an oceanview on a recent Baltic cruise (cool weather and very port-intensive). So it's really up to you. Different things are important to different people at different times.