[jleonard]

Yes. There are negatives and positives for every boat design.
Since you asked about negatives, here are a couple that are negative to ME.
You can't walk around the entire boat to handle lines. This was important to us, that's why we bought a trunk cabin style.
Sundeck boats also have limited visibility when backing into a slip. That's another reason the WE did not want a sundeck style.
Also they have more windage, another negative to ME.
And yes I know there are some work-arounds for those, but positives and negatives are more of a personal choice.