The C Dory 25 handles very well with the single engine--which ranges from 130 to 200 hp. Agree that they are not offshore fast boats like the Contender or Regulator Deep V's. But they will take anything that the sea can dish out at slower speeds--and as noted up to 2 foot chop. We really don't have a lot of longer swells in the Gulf, but they handle that fine. Boat handling takes practice, and learning what the boat will do in the conditions. They have a bit more windage than some similar sized boats--but that is because they have a pilot house type of cabin, with the visibility and airiness. If you notice, some have been fitted with RV type air conditioners for our Florida weather.
As for quality--who told you that it was not good has now owned one. Percent wise there are probably more of the original of the C Dory around than any other boat. There are few if any which have been "junked"--I don't know of any other boat with that reputation. Remember that these are cored bottoms, and that if you drill holes you have to be sure they are sealed, and that epoxy lining is best for any cut outs.
I know it is a long drive, but if you get up to Apalachicola in about 10 days, you will get a great sampling of C Dories, as well as a great party.