Normally I would have given three stars, because the view from the ancient sea wall is stunning, especially at night, but there are some downsides that shouldn't be overlooked.
The Venetian port gets overcrowded; there are moments, quite a few actually, when you feel suffocated by the crowds rushing around.
The whole area seems like a tourist trap; many items sold in the shops aren't related to the local culture.
There are plenty of restaurants around, but it's wise to check reviews from other tourists, especially those with three stars or less, to avoid unpleasant surprises. Most shoreline restaurants charge exorbitant prices (I once paid 45 euros for a palm-sized fish), serve frozen and reheated food (particularly seafood), and cleanliness can be an issue (we were shocked to find out we had to walk through a restaurant's kitchen to reach the restroom).
If you're keen on a sea excursion, it's better to head to one of the neighboring cities; most boats docked in the port charge very high prices (over 400 euros for a group trip of 4–5 people).
The port's highlight (the ancient sea wall) is poorly maintained and, in some spots, littered with garbage.
The last, but not the least, of the negative aspects: c'mon, people, please stop subjecting the poor horses to such a torment. There is nothing romantic or noble about strolling around the port in a carriage pulled by horses suffering from hunger, thirst and heat... not to mention the hustle and bustle of crowds, which alone is a significant source of stress for the poor animals.
Positive aspects:
Strolling on the old breakwater towards the lighthouse is really enjoyable. If you're lucky, you might even spot turtles swimming in the clear water.
PS: Be careful not to fall into the water, as some areas, covered with algae, can be very slippery, and the water is deep.