We have a thread for the negative aspects of living here, but there are positive ones too, otherwise we would never have come to Thailand, or remained here.
For me there are three that readily spring to mind. The weather. Sure, it does sometimes become unbearably hot, and the heat can wear you down, but in the UK it would become unbearably cold wet dull and dark which is far worse IMHO.
Then there is the food. Street vendors, restaurants, coffee shops, there is food everywhere and there is so much choice. For someone who enjoys eating out this place is paradise.
The most positive aspect, however, is the feeling of personal security. In London you dare not walk out alone after dusk. In Bangkok I feel entirely safe at any time of day or night.