I spent 1 night in Dusit D2 in beginning of january 2012 after a 3,5 week roundtrip in Lebanon, Qatar, Thailand, Laos, Cambodia and back to Thailand.
Dusit D2 had all the things I appreciate: Great service, very friendly and helpful staff, nice rooms, a great spa. Breakfast was delicious and one of the best on my trip. I never got the chance to use the pool, but it looked great.
I will strongly recommend this hotel if you want a nice and peaceful stay in Pattaya. If you want overcrowded hotels, noisy guests, undfriendly staff - go somewhere else.