Our lilacs are in full bloom and look gorgeous. When we moved into our house, the lilacs were stunted and sickly as a result of a big, ugly fence which blocked much of their sunlight, and possibly hot bbq grill ashes which the previous owner appears to have dumped at their base. In the 8 years we've lived here, we removed the fence and improved the bed in which they reside. (We used to call it the gravel pit, because it was a nasty, weedy patch filled with gravel and broken up bits of asphalt.)
I like to look back at photos from previous years so that I can see when things bloomed. For instance, last year our lilacs were in full bloom on April 7th! A full month earlier. Crazy.