Hello malinkey! I'll try to answer, but please bear in mind that I'm only an honourary Kent person (seeing as I've only been here 15 months!)
New Romney - don't know it
Folkestone - it's okay, a bit run down but I've seen a big improvement
Ramsgate - large seaside town and port, up and coming, new Turner Contemporary gallery going to make a BIG difference to Thanet (Margate, Broadstairs, Ramsgate)
Deal - apparently lovely, but limited transport links
Sandwich - same as Deal, loss over Pfizer factory will not have a good impact I wouldn't think
Whitstable - beautiful, quaint, arty fishing town, but overpriced considering the limited availability of property
Faversham - lovely market town, good transport links, good time to buy there as Londoners are buying there instead of Whitstable now as it's just as nice but property much more reasonable
Canterbury - cathedral city, absolutely beautiful, all amenities, but again it's more expensive. Traffic there, all day every day, is a nightmare too.
Seveoaks, Tunbridge Wells and Tonbridge - don't know West Kent as well, but I do know that these are desirable areas with proportionate property prices. Very, very expensive.