I am sorry to hear of brightoncb's unfortunate thessaloniki experience. It is true that here is a big urban centre, with little to no green, but the city's redeeming qualities are much more than the nice tavernas in the ladadika district. Thessaloniki enjoys a seafront position (I am sure someone who lives in Brighton can appreciate that!) and offers easy access to spectacular countryside be it mountain or beach should one be interested. But mostly Thessaloniki is a city at the crossroads of Europe, Asia and the Balkans and this truly makes it unique. This is evident everywhere you look: in its history, its architecture, its food and its culture. There are many cinemas, theatres, music performances of every kind. The 'coffee culture' can not be matched by anywhere else and the food can be amazing. The shopping in thessaloniki is fantastic with names like Louis Vuitton and Dolce and Gabbana stand alone stores as well as more affordable brands.
As a tourist you may also be interested in knowing that I personally consider thessaloniki a much safer destination than Instabul..not only in terms of terrorism but also in terms of being a woman traveller, in terms of dealing with the authorities and in terms of natural disasters (do you really want to be in Turkey when an earthquake strikes?).
Here is an EU city and really you can not compare the quality of life to a troubled country like Turkey.
We look forward to welcoming you next time you are in Greece!