We were in Casablanca hotel in the same time as previous reviewer from Plovdiv (that means in the final decade of July 2010 with storms and electricity black-out), but surprisingly, we have rather different opinion. According us, personal was friendly, managing the black-out chaos (all region northwards of Burgas was 30 hours without electricity) rather profesionally. Hotel has its own diesel generator, so the lack of warm water nad no lights in room in the evening were the only problems. As I understood, there were hotels and pensions without any water (and food) at all.
Food was excellent and plentiful (even for vegetarians) as same as beverages (three kinds of juices, three lemonades, water and soda), tea and cofees (prepared in coffee machines) and local beer of Pirinsko. In difference, we do not like their local wine. There was big offer of mixed drinks, but expect higher than usual proportion of spirits to beverages (for example tequila sunrise was more tequila than sunrise).
During our stay (we purchased all inclusive service), there were breakfest from 7.30 to 10.00, lunch from 12:30 to 14:30 and dinner from 18:30 to 21:00 ala buffet. Do not expect too much food outside of these times - there were only small snacks served on lobby and pool bars, which were usually eaten rather quickly by people sitting there. To take food outside of dining room is officialy forbidden but if you do not do it too much agressively, you will be tolerated. On the other side, it is not good idea to go to dinning room in swimming suits (waiters could get little bit upset). Personal is very quick in removing of plates. If you do not like for your stuff to be removed, watch your plates.
Probably the best view from hotel is in the north side - small river, meadow with peasant and his cows, horses and dogs. Big (but surprisingly not too loudy) disco hall on the left hand and sea in the right. There is a big Helios hotel on the east side (between hotel and sea) and signs of Bulgarian boom and bust economy (with unfinished buildings and construction sites) on other sides. Ribarska street (La Rambla of Obzor town) is cca 300 m out of the hotel with night life anywhere - but it is still quite silent Obzor, do not expect Ibiza.
There were two animation boys during our stay, but they lacked loudspeakers so if you do not like them, you can evade them. In the near Helios hotel, animations was much more agressive with no room for exit.
Other guests were from the whole Western and Eastern Europe - you can meet people from Norway, Sweden, Denmark or Germany, Poland, Czech Republic, Slovakia, Hungary, Romania, Bulgaria or Russia, Ukraine and even Moldavia, from young people through parents with small babies and some romances to pensioners.
One more advice to the end - small river along the hotel is changing its estuary every day. According this, it is throwing its (not so clean) water either northwards or southwards. As river estuary is quite shallow, it is good idea to go across it to swim in the clean water.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC